Historically, which region have the most US immigrants come from?

Mexico

Mexico is the top origin country of the U.S. immigrant population. In 2018, roughly 11.2 million immigrants living in the U.S. were from there, accounting for 25% of all U.S. immigrants. The next largest origin groups were those from China (6%), India (6%), the Philippines (4%) and El Salvador (3%). hope i helped have a goood day

Explanation:

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barack obama he actually listens