English is not, and never has been, the only language in America.
Too many different tribes there, the only language they all knew was English.
The only other language with over 100 speakers was French at 105.
English is the only language used of official purpose and education.
English was the only language students were allowed to speak.
English is the only language of instruction in all three institutions.
For 1,000 of those 5,000 speakers this was their only language.
It is the only language for laws, administration and courts.
They had a conversation in Latin, which was their only common language.
But it was the only language they had in common.