Native-born americans who saw the influx of new immigrants to the united states with concern were called

Native-born Americans who saw the influx of new immigrants to the United States with concern were called Nativists.

In the late 1800s, due to the huge entry of immigrants in America, a lot of anti-immigration feelings came forward. A huge effect on immigrants coming to the U.S. appeared in nativism. Nativism is a policy when people show favoritism toward native-born Americans.

this isn't a question and if you're going to list things be kind and use commas.

it required the unanimous approval of the states before the congress could enact any measure.