Yes they did. Abraham Lincoln banned slavery from slave states that included California.
1804
ban slavery
SLAVERY
The bill that unsuccessfully attempted to ban slavery in Mexico was The Wilmot Proviso.
Ban slavery in land obtained from Mexico
Slavery
Georgia
land acquired from Mexico
1863 I think
georgia
That would be Rhode Island.
He didn't like slavery. He wrote the Emancipation Proclamation which was supposed to ban slavery in all of the states that had seceded from the union.