We’re all immigrants originally, even ‘Native Americans’ who migrated over the Bering land bridge.

3 Maps from https://ows.edb.utexas.edu/site/hight-kreitman/land-bridge-theory:
mtdna-migration-pattern-world-map
beringamigration
y-dna-migration-pattern
.
Southwestern U.S. used to be part of Mexico:
Mexico_1824

immigrants-make-america-great(AP Photo/Jose Luis Magana)