Many immigrant groups—arab, czech, french, irish, italian, greek, jewish, and others—have contributed to what has been known as a "melting pot" in america. what term do anthropologists prefer today to better reflect the role of ethnicity in the united states?

The term that Anyhropologists prefer today is multiculturalism.

this is a pretty broad question and can be a pretty lengthy answer. since 1900, women have gained a lot more rights and have become active in the workforce. with women being in the workforce, men play a larger role in family life. many family tasks are shared between men and women, whereas, women used to be the sole family caretakers.

that should get you started at least.