The emancipation proclamation took effect
immediately after president lincoln wrote it.
before the battles of chancellorsville and antietam.
many years after the end of the civil war.
after southern states refused to rejoin the union.

the actual answer is D)after Southern states refused to rejoin the Union. Trust me I just took the test. :/

united states reinforcements contributed greatly to three allied victories in france at: cantigny (first major american battle), argonne (the largest in the united states military history, involving 1.2 million american soldiers), and château-thierry (one of the first actions under general pershing).