Answer:
Abraham Lincoln stated in the emancipation proclamation that:
All person held as slaves were and henceforward should be free.
Step-by-step explanation:
Abraham Lincoln did this statement in the emancipation proclamation, however, it only applied for the states that had seceded from the United States, because the states under the United states rules were not included in that statement. Also, it didn't apply for the states that were former south fighters but that gave up and left the war to accept the United States rules and laws. And Furthermore, it only applied if the Northerners managed to achieve victory.