Because it did not pass the vote in Congress, so it did not become law. But Abolitionists treated it almost lke a law - that there should be no slavery in any of the territories acquired from Mexico.
the proviso would upset the balance of power between the north and the south
They generally favored it.
They opposed it because that the inevitable addition of new free states to the Union would shift the balance of power permanently to the North. But, it was rejected by the Senate anyways. Also some believed that it undermined their constitional rights because they believed slaves were property.
The thirteenth amendment ended slavery which was one cause of trouble between the north and the south.
there is none. ideas have been tosses around but to date there is no bridge between Spain and North Africa (strait of Gibraltar) to date.
the proviso would upset the balance of power between the north and the south
the proviso would upset the balance of power between the north and the south
Serious regional differences between the North and the South.
It increased tensions further between the North and the South
the proviso would upset the balance of power between the north and the south
The Wilmot Proviso, which was one one event that lead up to the American Civil War, would have banned slavery in new territories and land.
It had strong Northern support.
They generally favored it.
The north
The Wilmot Proviso aimed to ban slavery in territories acquired after the Mexican-American War, specifically in the lands taken from Mexico. It was a controversial proposal that heightened tensions between the North and South over the issue of slavery expansion.
abolitionism
Generally the North.