More to explore:
This pin shows a valid political cartoon that justifies immigrants coming to the United States illegally for freedom. (Click on the image to find a video and analysis of immigration in the United States)
I'm sorry, but unless we're talking about drugs and weapons trafficking which no one wants, the other capital is legal. So yeah, they can cross borders, if they do it legally. Even between Mexico and Central America.
Immigration reform: A primer
Map of European Immigration to the United States
What are the biggest immigrant groups in your state? | About 15% of new immigrants to America are from Mexico. Here's where other immigrants are coming from in every state