What was the most crucial factor for the failure of the era in the 1970s?

The most crucial factor for the failure of ERA in 1970s was the fact that the majority of votes for ratification were not obtained.

Explanation:

The ERA ratification was supported by almost everyone. However, a few voices were raised against the ratification stating that the amendment would do away with the protective laws like alimony, sexual assault and would also eliminate the chances of mothers getting the custody of the child after divorce. The needed 38 votes were not received as only 35 votes were received and the ERA failed.

equal pay act of 1963. the equal pay act, signed in to law by president john f. kennedy on june 10, 1963, was one of the first federal anti-discrimination laws that addressed wage differences based on gender. they felt that this would prevent employers from undercutting future wages for men.

you didn't list the options. however, a few communist countries today are: the people's republic of china, north korea, and cuba.