I would wonder if there are some places in the Southwest where Spanish is basically the first language in the community.
There are, but in most of these places, at least those born or raised in the U.S., can speak English.
There are lots of immigrants who do not speak English, but do they vote? Remember, you have to be a citizen to vote, and you have to know English to be naturalized. So are there really that many American voters who don't know any English?
You have to know some English to be naturalized as a citizen, but many naturalized citizens aren't truly fluent.
