1. To work. 2. And the US allows it, because it needs the cheap labor cost to be competitive.
Mexico
Mexico and China.
Mexico
In the US, Mexico
Mexico
Mexico...
Three fifths of the immigrants on Earth immigrate to the United States. The majority of these immigrants come from Mexico and Canada with a few from Germany.
Asia, China, and I believe Mexico
Mexico, Guatemala, Honduras
Mexico
mexico
Mexico, Germany, Spain, England, Ireland, china etc.