The correct answer to this open question is the following.
A free trade area that includes Canada and the United States, but not Japan, is the North American Free Trade Agreement (NAFTA).
Japan is not part of NAFTA. The third country that is part of NAFTA is México. The three countries form the largest free trade area in the American Continent. Recently, the respective Congress of these three counties has been revising the details of a new free trade called USMCA: United States, México, and Canada Agreement.