“As long as this country doesn’t have an official language, I expect that they can do as they please.”
You got that right; a big oversight on the Founding Fathers’ part not to make English the official language of the USA.
“In the end, bilingualism simply holds back the people it is purported to benefit.”
Yes, but it provides (teachers, teacher aides, translators, etc., etc.,) jobs and guaranteed Democrat votes to keep the programs (a.k.a. their jobs) in place.
I believe there was no official language because of the number of Germans in the colonial army; they were the largest minority at the time. Not that they would fight for the crown, but they might just not fight.