It's not strange at all: those initial waves of Cubans were some of the most educated people on the island, highly skilled and all sent to the same general area in masse, with government assistance and free to associate as they saw fit in the one place in continental US where their mother tongue could be used freely as an asset while assimilating into the major culture on their terms. Very different situation and one that, I must say having been born and raised in Miami, they absolutely knocked out of the park. Again, very different situation, they were free to do as they pleased and placed in large numbers in an area where their mother tongue was an asset. They also came bearing significant skills and education and, after a period of hard work and adjustment, yes, put those skills to use. But... very different situation.