Most of the agriculture in North America is located in the central United States.
Explanation: If one looks at the map legend it defines yellow as representing areas that are agricultural. When looking for yellow on the map the largest expanse of yellow is noted in the central United States region. California has no noted agricultural lands. Mexico has a quantity of agricultural lands on their east coast but no where near as much as the central United States. The southwestern portion of the US has some agriculture but no where near as much as the central US once again.