Please help. I’ll mark you as brainliest if correct!!!
The sentence that expresses the main idea is
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Explanation: it is always the first sentence or in the first paragraph.

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."