In absolute numbers, the US is the #1, but immigrants as percentage of population has the US as #65 (Canada #41).

Still way higher than Russia or China. While a little over 15 % of the US population are immigrants (defined as not born in the country), only 0.07 % of the Chinese population are immigrants. Roughly 7 % of Russian population is immigrants.

Source: https://worldpopulationreview.com/country-rankings/immigrati...