From the 1989 Canada deal to USMCA, a timeline of North American trade

Picture a pickup truck, a hypothetical one, rolling off an assembly line in the Midwest. Before it gets there, its engine block may have been cast in one country, its transmission machined in another, its wiring harness stitched in a third, and some of those parts may have crossed a border more than once on the way. A line on a map looks neat. A supply chain does not.

That supply chain is the reason North American trade rules matter to your family. They decide what a truck costs, whether a plant stays open, and where a farmer sells his corn. And here is the part that surprises people on both sides: the rules were not written by one party. Republican and Democratic presidents built this system in turn, each fixing or reworking what the last one left, and the dates tell the story better than any speech.

So let's walk through it in order. Each entry gives the date, the people, and a line on why it mattered. At the end I will give you a verdict on the whole arc.

Before the deals: 1854 and 1965

1854: the first Reciprocity Treaty. The United States and British North America agreed to trade many natural products, such as grain, lumber and fish, without duties. It lasted until 1866, when the United States gave notice to end it. Why it mattered: it proved the idea was old. Neighbors on one continent trade, and the argument is about terms.

January 1965: the Auto Pact. President Lyndon Johnson and Canadian Prime Minister Lester Pearson signed the Canada-United States Automotive Products Agreement. It allowed duty-free trade in vehicles and parts between the two countries under conditions meant to keep Canadian production in place. Why it mattered: it created an integrated North American auto industry decades before anyone used the word "supply chain," and it showed that managed trade can work for both sides.

1979 to 1989: the Republican idea becomes a treaty

November 1979: a North American idea. When Ronald Reagan declared his candidacy for President, he floated the idea of a North American accord linking the United States, Canada and Mexico. Why it mattered: it set a direction for the party years before the paperwork.

March 1985: the Shamrock Summit. At a meeting in Quebec City, Reagan and Canadian Prime Minister Brian Mulroney, whose Progressive Conservatives had won power in 1984, agreed to explore a bilateral free trade agreement, and formal negotiations followed. Why it mattered: a Canadian conservative and an American conservative, working together, started what Democrats and Republicans alike would later argue over.

January 2, 1988: signing. Reagan and Mulroney signed the Canada-United States Free Trade Agreement. Congress passed the implementing legislation later that year, and Reagan signed it in September 1988. Why it mattered: the agreement phased out tariffs between the two countries over ten years and set up binational panels, known as Chapter 19 panels, to review antidumping and countervailing duty decisions. For the first time, a trade deal gave a neutral panel a say over a country's trade remedy rulings.

November 21, 1988: Canada votes. Mulroney's party won a federal election fought largely over the agreement. Why it mattered: it showed that the deal had a real democratic mandate in Canada. The agreement was not slipped through. It was fought out in the open.

January 1, 1989: entry into force. The agreement took effect. Why it mattered: it tied the United States to its largest trading partner by treaty, and it took effect under a Republican President in his final weeks in office.

1990 to 1994: NAFTA

June 1990 and after: Mexico joins the conversation. Mexican President Carlos Salinas de Gortari, who had begun opening his economy to the world, pressed for a free trade agreement. President George H. W. Bush agreed, and Canada joined the negotiation. Why it mattered: a developing country with a growing market sat on our southern border, and the trade question now included wages, migration pressure and environmental rules in one conversation.

December 17, 1992: signing. Bush, Mulroney and Salinas signed the North American Free Trade Agreement, in separate ceremonies, weeks after Bush lost the presidential election. Why it mattered: the deal was a Republican product, negotiated and signed by Republican leaders, and handed to an incoming Democratic President to finish.

1993: Clinton adds side agreements. President Bill Clinton negotiated side agreements on labor and the environment to win over Democrats who were skeptical of the deal. Why it mattered: it set a template. Every trade deal afterward would be argued partly as a labor and environmental question, and the template shaped the fights of the next three decades.

November 1993: Congress votes. The House and Senate approved the NAFTA implementing act. In the House, a majority of the yes votes came from Republicans, because many House Democrats, aligned with organized labor, opposed it. President Clinton signed the implementing law on December 8, 1993. Why it mattered: it is among the clearest cases of Republican votes carrying a Democratic President's signature trade achievement through a Democratic Congress. Both parties split internally, and the old party lines did not hold.

January 1, 1994: NAFTA takes effect. The agreement began phasing out most tariffs among the three countries, with schedules that ran for years in the most sensitive sectors. It also set rules of origin, which are the rules that decide whether a product counts as made in the region and therefore qualifies for the lower duty. Why it mattered: rules of origin are where the real fights happen. They decide how much of a car must be made inside the region to get the free-trade rate, and that decides where the plants go.

1995 to 2016: living with the deal

The long middle. Over the next two decades, trade among the three countries grew and supply chains deepened. Farm and auto sectors especially became tightly linked. Critics blamed the agreement for lost factory jobs in particular towns, and supporters credited it with lower prices and stronger export markets. The honest verdict, as with most trade stories, is that both things happened. Studies of the net effect disagree on size, and the debate about it is a fair one. Why it mattered: by 2016, a deal first sold as an opportunity was being run against, from both parties' primary candidates, as a mistake.

2017 to 2020: the renegotiation

May 2017: notice. The Trump administration formally notified Congress of its intention to renegotiate NAFTA. Why it mattered: it set the legal clock under the trade promotion authority framework, which obliges the executive to consult Congress.

2018: tariffs as pressure. In March 2018, the administration imposed tariffs on steel and aluminum under Section 232, and Canada and Mexico were part of the pressure campaign. Those tariffs were lifted for both countries in May 2019 as the deal moved toward ratification. Why it mattered: it was an example of the leverage argument in action, and it also drew objections from steel-using manufacturers and farm-state members who feared retaliation. Both reactions are fair.

September 30, 2018: a three-way deal. The United States, Mexico and Canada announced agreement on a new text. An understanding between Washington and Mexico City had come first, in late August, and Canada joined at the end of September. Why it mattered: the talks nearly broke into two bilateral deals, and the announcement kept the three-country structure intact.

November 30, 2018: signing. President Trump, Mexican President Enrique Peña Nieto and Canadian Prime Minister Justin Trudeau signed the United States-Mexico-Canada Agreement (USMCA) at the G20 meeting in Buenos Aires. Why it mattered: the signing was a start, not a finish, because Congress still had to approve the implementing legislation.

What the new agreement changed. The auto rules of origin were tightened. For passenger vehicles, the share of a car's parts that must be made in North America to qualify for zero tariffs rose to 75 percent, up from 62.5 percent under NAFTA. A separate labor-value requirement said that a large share of a vehicle's content had to be made by workers earning at least $16 an hour. Canada opened part of its dairy market to American producers. The investor-state dispute system was largely dropped between the United States and Canada. Why it mattered: these are the provisions that decide where auto plants are built and where parts come from, and they were the center of the bargaining.

Here is what the auto rule means in dollars, using a hypothetical vehicle so the arithmetic is clear. Suppose a car has a net cost of $30,000, and the rule is measured against that figure. At 62.5 percent, $18,750 of the cost (30,000 times 0.625) had to come from North American parts and labor to qualify for zero tariffs. At 75 percent, the requirement is $22,500 (30,000 times 0.75). The difference is $3,750 per car that an automaker must either shift into the region or pay a tariff to avoid. Multiply that by a million cars and you can see why plant location was a negotiation, not an afterthought. Real calculations use a more detailed formula and separate rules for core parts such as engines and transmissions, so treat this as an illustration of scale, not as a customs worksheet. The treaty text itself is on the Trade Representative's website.

December 10, 2019: the Democratic amendments. After months of negotiation with House Democrats, led by Speaker Nancy Pelosi, the three governments signed a protocol of amendment that strengthened labor and environmental enforcement and revised dispute procedures. Why it mattered: it is a good example of divided government at work. A Republican President's text was improved, on terms Democrats wanted, in exchange for votes. The deal passed the House on December 19, 2019, and the Senate on January 16, 2020.

January 29, 2020: signature. President Trump signed the implementing law. Why it mattered: it took the agreement from text to American law.

July 1, 2020: entry into force. USMCA replaced NAFTA. Why it mattered: the same continental market had new rules, and the question of who would enforce them started to matter more than the question of who wrote them.

The review clause

July 1, 2026: the six-year joint review. The agreement does not simply run forever. It has a built-in review at six years. If all three countries confirm in writing that they wish to continue, the agreement's term is extended to sixteen years from that point. If one does not confirm, the countries must review annually, and the agreement ends in 2036 unless it is extended. Why it matters: the clause turns a trade treaty into a standing negotiation. Every review is a chance to renew, and also a chance for any partner to demand changes. For the current status of the review, check the Office of the United States Trade Representative's website rather than any newspaper summary, because the process has several steps and the headlines are often ahead of the paperwork.

That clause is the reason this story is not finished. It is also the reason a family that depends on a border-crossing supply chain should pay attention to it.

What the arc teaches

Let me give you the verdict, and let me argue it, because I think the timeline supports it.

1. This was a bipartisan, internationalist project, built by both parties. Reagan started it, Bush negotiated it, Clinton finished it, Trump rewrote it and Pelosi amended it. Anyone who tells you it belongs to one party has not read the dates.
2. The details matter more than the slogans. The fights that mattered were not about "free trade" in the abstract. They were about rules of origin, wage requirements, dispute panels and dairy quotas. Whoever controlled the text controlled the result.
3. Congress held the pen, as the Constitution says it should. Article I, Section 8 gives Congress the power to regulate commerce with foreign nations. Presidents negotiate, but a trade agreement becomes law only when Congress passes the implementing legislation. That arrangement is why the 2019 amendments happened.
4. Reasonable people disagree about the net effect. Supporters point to deeper supply chains and cheaper goods, and critics point to specific towns that lost plants. Both groups can cite real examples. A conservative who is honest will admit the second group exists.

There is a fair objection to all this, and I will state it at full strength. Critics say each of these agreements put the interests of multinational firms ahead of the interests of workers in a given plant, and that the supposed gains never reached the people who lost. That is not a silly claim. The remedy, however, is better rules and better adjustment help, not a retreat to a continent of walls. You do not fix a bad contract by tearing up the neighbors' handshake.

For more on this, see free trade, tariffs or managed trade, three theories side by side, who really pays a tariff, following the dollar from dock to shelf, Ronald Reagan was no free-trade purist, and his record proves it, divided government gave us welfare reform and a balanced budget and seven trade myths both parties repeat, tested against the record. The page on /politics/bills/ tracks legislation if you want to look up the implementing acts.

The bottom line

• North American trade rules were written by presidents of both parties: Reagan and Mulroney in 1988, Bush in 1992, Clinton in 1993, and Trump with House Democrats in 2018 through 2020.
• The details that decide your community's fate are the rules of origin, the wage rules and the dispute procedures, not the slogans.
• Congress, not the President, has the final say on trade. Call your representative before a trade vote, not after.
• The USMCA has a six-year review built in. Check the Trade Representative's website for where it stands, and do not rely on a headline.
• If you work in a plant or farm a field that depends on the border, read the rules that affect your product. They are public.