Many years ago we had a vote on “English Only” here in California. At the time I had a VERY conservative roommate. I was surprised when he said he was opposed to English only. Then he explained; “If these people learn English they will be able to compete with me for jobs. I don’t want that.”
The English Only Proposition failed.
I thought the proposition for English only (ending “bilingual education”) passed, but was overturned by a judge; at the time I remember libs asking Mexicans why they supported an end to bilingual education, and their (pleasantly surprising) answer was that they wanted their children to have better jobs than they had.