The map on the left displays the Hispanic percentage for each US state in 1940. Contrast that with the map on the right displaying the Hispanic percentage for each US state in 2010. The Hispanic population in 1940 was mostly concentrated in the southwest border states of Arizona, New Mexico, and Texas, but over the next 70 years, migration and birth rates spread the population throughout the entire southwest, west coast, and major cities on the east coast. New Mexico continues to be the US state with the highest concentration of Hispanic population with 41% in 1940 to 46% in 2010. Nationwide the Hispanic population has increased dramatically over the past 70 years – from around 1.4% in 1940 to 16.3% in 2010!