Well there’s that, and the fact that escaping grinding socialist poverty tends to make someone appreciate the freedoms here and motivated to take advantage of it.
Take any immigrant group from a country with a thug government, vs. any complacent group here, especially one that’s been told it’s “entitled” and made dependent on handouts.
Asian immigrants vs. Americans as a whole.
African immigrants vs. inner city blacks.
Cubans escapees vs. illegal Mexican aliens.
there’s other inherent factors as well; such as how much money they come with or how much education they have. I met a suprisingly large number of African - immigrant college graduates that have become taxi drivers in San Francisco...