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==Summary==
What is today the southwestern United States once belonged to Mexico and the war that gave that land to the United States has been seen by many historians as having been sparked so that the territory could be taken from Mexico. While the early 20th century saw a lot of turbulence at the border, most of the late 20th century and early 21st century problems have economic causes, although at times violence in Mexico and other Latin American countries has sparked some waves of migration to the border regions.
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