But relatively, it's upper-midpack as an immigrant nation. It ranks 65th worldwide in terms of percentage of population that is foreign-born, according to the U.N. report "Trends in International Migrant Stock."
Whether tax havens and worker-hungry Gulf states, refugee sanctuaries or diverse, thriving economies, a host of nations are more immigrant-dense than the famed American melting pot.
While the U.K. remains Australia's largest immigrant source, the nation's Asian population has grown at a steady clip since the 1975 Racial Discrimination Act, which marked the end of the White Australia Policy (yes, it was that blatant). Migrants from India have almost tripled in the past decade, to 337,000, or 1.6 percent of the total population. Chinese and Vietnamese fare prominently in Australia's makeup, too, with 1.8 and 0.9 percent, respectively.
Ireland has played host to a surge of Muslims from everywhere: from Arab countries to Balkan ones. They now constitute 1.1 percent of the population, up from 0.1 in 1991, and Islam could surpass Protestantism — at 5 percent of the population in 2011, the nation's second-most popular religion, trailing Catholicism — by 2043.
Croatia and Estonia — which have an average GDP per capita of $14,295, a third of the United States' — also have a larger piece of foreign-born population pie than the Americans. And plenty of European countries have larger net migration inflows than the United States: Portugal, Spain, Italy, Norway, the U.K. and all the aforementioned countries.
Tax Havens And Gulf States
Then there are the global rich's favorite tax-saving second nations: Monaco (64.2 percent foreign-born), Andorra (56.9 percent), Luxembourg (43.3 percent) and Singapore (42.9 percent), among others.
Another way to attract the world's fat pocketbooks? Cash for citizenship. For $250,000 you can claim St. Kitts and Nevis as home, and for $100,000 you've got yourself a passport from Dominica, both of which are Caribbean island nations. Others, like Austria, have a visa by investment program that comes with coveted EU access. It's not surprising, then, that immigrants make up 15.7 percent of Austria's population.