What language should we be brushing up on?

Trump endorses bill to halve legal immigration
In 1492 Columbia traveled the ocean blue for then Queen Isabella of Spain.
The First People were the ‘natives of the land’.
The First Europeans
Were the Norse
Then the Spanish.
Then the Dutch.
Followed by the English.
So my question is,
If we are going to kick out all of our immigrants, what language should we need to be brushing up on?