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I think the logic is many of the Cubans first came as political refugees escaping Castro, and so tended to be at least anti-left if not upper class so they identified more with the Republicans.
Mexicans and Central Americans on the other hand were more likely to be economic migrants and have voted more in line with their economic interests.
During the last Obama election I read an interesting article about whether the Republicans should be trying to secure more of the Latino vote on a socialy conservative platform. The rational being that they tend to be more religious and family oriented which fits with a Republic narrative.
I guess in real number terms Trump realised that no matter the large number of Latinos they're not a large enough group to worry about loosing.
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Also to add to @hugo7 point on Cubans in Florida, my gf is Cuban and lives in Miami and says a lot of it also goes back to Kennedy and the Bay of Pigs. A lot of the older generation still haven't gotten over this, and have voted Republican for a long time.
Trump also got about 30% of the Hispanic vote which I found a bit surprising.