SAT Grammar. Singular vs Plural. Navajo are???

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<p>I am on the second edition blue book pg 803 question 9. The correct answer (which I was able to get because it was sentence improvement, not error identification) was "the Navajo...speak an Appachean language". I was able to get it through POE but the question is what other similar words would be plural? </p>

<p>I am aware there can be all are but I fail to recognize constructions such as " the America are" or "the Europe are". Of course, I am aware of certain similar examples including " the Hindu are" or "the Mayan are". nonetheless, I cannot say that I know all of them. If anyone has any tips or ideas, please do help! Thanks!
-just freaking out for test tomorrow. gotta be safe than sorry-</p>

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<p>America is a place. Europe is a place.
The America are is incorrect. The american people are is correct or the Americans
The floridians are not the florida are</p>

<p>The Navajo are a group of people</p>