Until October 2015, trade in conifers was governed by a seven-year agreement (SLA), concluded in 2006 and extended by two years until 2015 since then and limiting Canadian exports to the United States. Under a complex formula, the United States allowed unlimited imports of Canadian softwood lumber if market prices remained above a certain level; When prices fell below this level, Canada raised export taxes and/or quotas. In addition, the United States has returned to Canada a large portion of the tariffs it had collected as a result of previous trade assistance agreements. With a population and economy one-tenth the size of the United States, Canada has always been sensitive to being swallowed up by its neighbour to the south. Whether by defending the actual attacks of the United States during the War of 1812 or by resisting free trade with the United States for more than the first century of its history, it has tried to chart its own course of action in the world, while maintaining its historical and political ties with the British Commonwealth. Some in Canada question whether U.S. investment, regulatory cooperation, border harmonization, or other public policy issues are ceding too much sovereignty to the United States, while others are taking a rather North American approach to their neighbourly relationship. The BC border along the bordering United States begins southwest of Vancouver Island and northwest of the Olympic Peninsula, at the point of arrival of the international waters of the Pacific Ocean.  It follows Juan de Fuca`s road eastwards and turns northeast to join Haro Street. The border follows the strait in a northerly direction, but turns sharply east through boundary pass and separates the Canadian islands in the Gulf from the American San Juan Islands. On accessing the Strait of Georgia, the border turns north, then northwest, and divides the strait north to the 49th parallel.
After a sharp curve to the east, the border follows this parallel across the Tsawwassen Peninsula, separates Point Roberts, Washington, from Delta, British Columbia, and continues to Alberta. After the Obama administration denied presidential clearance in 2015, the Keystone XL pipeline was revived by the Trump administration. Once keystone XL is completed, it would be the most important new pipeline to bring Canadian oil (mainly bitumen) to the United States. On March 23, 20, 2017, the Department of Foreign Affairs authorized the President for the pipeline terminals and the Nebraska Public Utilities Commission authorized, on November 20, 2017, an alternative main line through Nebraska. Canada supports the construction of the pipeline, but has raised concerns about proposals to limit supply for the construction of the pipeline to U.S. companies. The pipeline highlighted the resistance of the interests of environmental, agricultural and land owners. While litigation is still ongoing over the pipeline, Trans-Canada has begun preliminary work – such as measures – on the route, but has yet to commit to building the pipeline itself.
The United States and Canada enjoy one of the largest bilateral trade relations in the world. Over the past thirty years, the U.S.-Canada trade relationship has been governed first by the 1989 U.S.-Canada Free Trade Agreement and then by the 1994 North American Free Trade Agreement. .