Top 10 Countries with the Highest Number of Foreign-Born Residents (Immigrants).
The United States is home to the highest number of immigrants in the world. An estimated 50.6 million people in the United States—a bit more than 15% of the total population of 331.4 million—were born in a foreign country. The number of immigrants in the U.S. has increased by at least 400% since 1965. The population of immigrants in the United States is incredibly diverse, with nearly every country in the world represented among U.S. immigrants. Mexico is the leading origin country for U.S. immigrants, accounting for more than 11 million, roughly 25%, of all immigrants in the United States. Immigration, of course, played a formative role in making the U.S. the country it is today: except for those whose ancestors arrived as slaves, the majority of citizens of the "Great American Melting Pot" are descended from immigrants—and early European settlers in particular.
https://worldpopulationreview.com/country-rankings/immigration-by-country