Has the USA ever been successfully invaded?

Yes.

An estimated 20 MILLION illegal aliens and counting.

Yes. By Britain during the War of 1812.

The British occupied vast swathes of the North and North Eastern States, some of the Southern regions, blockaded the Eastern seaboard and set fire to the White House. They did not fully withdraw until the Treaty of Ghent in 1815.

The Beatles invaded quite successfully. Only one of them was shot to death, and they went home with so much money that the Queen Knighted one of them.

Why don't you read a history book...or have you ever heard of this thing called a "search engine?"

Yes White man come in big boat.

no.