Final answer:
The largest exporters of goods to the United States in 2010 were Canada, Mexico, and China. These countries have been top trading partners due to proximity and strong economic relationships.
Step-by-step explanation:
The three nations that exported the largest amount of goods to the United States in 2010 were Canada, Mexico, and China. According to numerous trade data sources, these countries are consistently among the top trading partners with the United States. Canada and Mexico are part of the North American region, enabling close and extensive trade relationships through agreements such as the North American Free Trade Agreement (NAFTA), which has now been replaced by the United States-Mexico-Canada Agreement (USMCA). China, with its vast manufacturing capabilities, exports a wide range of goods from electronics to apparel. The strong economic ties between these nations and the United States are a result of both geographical proximity and the complementarity of their respective economies.