If we use "percentage of the population born overseas" as a metric, quite a few countries have larger immigration programs than the US: https://data.oecd.org/migration/foreign-born-population.htm

Your source is the OECD, which is basically just Western, developed countries.

If you look at the entire world, the picture is different.

The US has had a huge immigration program (although it has waxed and waned) over many years because settling vast tracts of land requires a lot of human labor. Same story in Australia.