It covers more than a trillion dollars in trade across thousands of kilometres. It replaces the North America Free Trade Accord that created the largest free trade region in the world when it came into effect in 1994. That was then. What have we got NOW with the United States-Mexico-Canada Agreement, or USMCA as it's called? It covers more than a trillion dollars in trade across thousands of kilometres. It replaces the North America Free Trade Accord that created the largest free trade region in the world when it came into effect in 1994. That was then. What have we got NOW with the United States-Mexico-Canada Agreement, or USMCA as it's called? The Agenda discusses what the new trade deal means for Ontario.