I have heard and read about the Japanese internment during WW2, but this I had not previously known:

BBC | US Mexicans haunted by repatriation

[…]

As the depression deepened, state and local governments passed laws restricting employment to native-born or naturalised citizens.

The Federal Government required all firms supplying it with goods and services to hire only US citizens.

And private companies fell in line with the prevailing anti-Mexican feeling and sacked their workers.

Francisco Balderrama, professor at California State University and co-author of Decade of Betrayal, estimates that somewhere in the region of a million people of Mexican origin were driven out of the United States during the 1930s.

Nearly two thirds of those who left were US citizens.

[…]

Around 50,000 people were formally deported in the 1930s.

[…]

Governor Arnold Schwarzenegger has refused to approve Senate bills that would require schools to include the repatriation in the curriculum, and to offer victims compensation.

Time to start deporting Austrians? ;-)

[ Link ]