Which one of these statements could be a main idea

The main idea basically sums up what you read. If the most important part, the main conflict, and the climax are included or alluded to, then it is most likely the main idea.

Explanation:

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because of all the immigration, america became one big melting pot. the diversity of cultures from all over the world made america somewhat divided as well. people that immigrated stayed with their kind, and their traditions, while native born americans stayed with their kind and their traditions. normally, people born in american scorned the immigrants as well. the new religions also divided america. in summary, it took away from the american culture and identified america as the "melting pot."