I read that French as spoken in Canada is more like the French of the time of the settling of Canada than European French is.A Greek-American friend grew up being told,Which illustrates the natural conservatism of the emigre."Marry a Greek girl." He graduated college and saved a bit of money and gave his mother a trip back to Greece. But time (and WWII) had not passed Greece by, and Greeks were different than she remembered from her childhood.
She returned to America and told her son,
"Marry a Greek-American girl."
AFAIK, the same is true of English as well.