Migration Policy Institute - Explainers
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Through which visa categories can immigrants move temporarily or permanently to the United States? What are the main channels by which people come, and who can sponsor them for a green card? Are there limits on visa categories? And who is waiting in the green-card backlog? This explainer answers basic questions about temporary and permanent immigration via family, employment, humanitarian, and other channels.
How has the size of the unauthorized population in the United States changed over time? How is illegal immigration changing, and where do unauthorized immigrants come from? This explainer answers basic questions about illegal immigration, the changing patterns from Mexico, and more.
Who is an immigrant? Does that status change if, for example, a foreigner marries a native-born resident or serves in his or her adopted country's military? This explainer answers basic questions about international migrants—who they are, their top destinations, where they come from, how they are counted, and more.