Read the following excerpt from mrs. drainger's veil by howard mumford jones:

emily, of course, had changed. she met me at the door as she met you. she was a shell burned out by one fierce moment of fire.

metaphor.
euphemism.
alliteration.
flashback.

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."