Which act effectively ended the Congressional policy of neutrality?

The Lend Lease Act.

Explanation:

The Lend Lease Act effectively ended the Congressional policy of neutrality.

a. by accepting the election of president abraham lincoln in 1860 and convincing other southern states to do the same

traditionally, roman society was rigid. by the first century. however, the need for capable men to run rome's vast empire was slowly eroding the social barriers. the social structure of ancient rome was based on heredity, property,wealth, citizenship and freedom.