The United States is the world's leading agricultural nation, despite a small percentage of the population being involved in farming. Agriculture is a major industry in the US, with over 2 million farms cultivating over 900 million acres. Farming is concentrated in the central Great Plains and around the Great Lakes. The US is the top global supplier of grains, dairy, meat, and soybeans, producing a disproportionate amount relative to its farm land area. However, overproduction has lowered prices and caused difficulties for some farmers.