The time of change in the region called the "borderlands" occurred during the period between 1880 and 1940. The region became urbanized and ended its years of isolation from the rest of the world. In the past the region's economy was based on ranching and farming. As the region became more urbanized the economy changed. The economy did not change equally between the United States and Mexico, the United States' side of the border boomed while Mexico's side did not. The cities that did prosper in region were based on the actions of the United St ....