Does that include German's in Missouri & Wisconsin, Russian's in Portland and Sacramento,
Gullah's of Coastal Georgia and South Carolina, Muslims in Michigan, Syrian Yogurt makers in Idaho,
as well as Creole people in NOLA ?
What are you getting at here ?
Immigrants likely do know English as well as the "AVERAGE U.S. Citizen",
and many are versed in 3 to 5 other European Languages in addition to their own.
Hate to be a spoiler for you, yet here is a not so secret, secret:
The AVERAGE American is ignorant ; and illiterate,
allegedly because of their own lack of individual effort in school. SLACKERS