It should be cultures that do not assimilate.
“cultures that do not assimilate.”
How to measure “assimilate”? Mexican immigrants tend to be conservative Catholics. Most Central American Catholics are much more liberal. The conservatives have left the Catholic church and are not Protestant, Mormon, Or ... Most speak, understand little or no English.
Nigerians speak, understand English. Most are Christian but in on broad range of liberal to conservative Christian.
Most Indians are Hindu or Muslim. Their assimilation skills vary greatly. Some have strong belief in right and wrong. Some seem to take flexible morality to very unAmerican lengths...but no different than some Americans.
Some Amish are Pennsylvania Dutch, speak a version of German and never assimilated in hundreds of years. When I moved to Chicago, most Poles, Ukranians, Slavs did not speak or understand English. They had to go to the Jewish merchant to translate as the Jewish merchants were always tri-lingual or more.
How do we measure assimilation?