First of all... what period? because if you are talking about this time, I think it is becaise they want to feel powerful to be able to have more allied countries in any situation, they also do it because they want to control most of the world natural sources that other countries have.
By the end of Civil War, as many as five million longhorn cattle, descendants of old Spanish stock, roamed wild in Texas.
Giant dust storms swallowed the Great Plains. Yet as the crisis deepened, Herbert Hoover struggled to respond to the nation's problems. As a result of Hoover's failed response, in 1932 Americans would turn to a new leader and increased government intervention to stop the depression.
The border dispute is the alamo
