When I received mu US citizenship, they did test my English and wanted me to learn US constitution. But that was back in 1970. I am sure things are more lax now.
Recently I looked into requirements to immigrate to New Zealand. Every immigrant to NZ must pass written English test administered by gov’t of NZ. And there are other very stringent requirements.
Glad to have you among us entropy12!
This country is enriched by intelligent immigrants like you :-)