Because English is vital to being part of a unified American culture.
If the US annexed Canada, I would also not want Quebec as a state for the same reason. Either make it a territory or give it independence.
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I consider the current native speakers of New Mexican Spanish, whose family settled in New Mexico in the 1600s, to be equally a part of the "unified American culture" as you are.
The same for the Amish who speak Pennsylvanian German, the Gullah speaking people, the Cajun speakers, and the many indigenous people of North America who speak Navajo, or Hawaiian, or language at home.
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That's completely untrue. The US has no national language, and bilingualism is something to encourage not suppress. There are 41 _million_ spanish speakers in the US. HI, AK, ND, LA, PR, NM all have more than english as an official language.
The more language learning is taught, the more Americans of every type can appreciate other cultures, and the more new Americans feel supported in their communities.
Take the nationalism elsewhere.