It depends on the date since slavery had been practiced in all the British colonies. The division between slave and free states began during the American Revolution (1775–1783).
Five of the Northern self-declared states adopted policies to at least gradually abolish slavery: Pennsylvania (1780), New Hampshire and Massachusetts (1783), Connecticut and Rhode Island (1784). Vermont abolished slavery in 1777, while it was still independent, and when it joined the United States as the 14th state in 1791 it was the first state to join untainted by slavery. These state jurisdictions thus enacted the first abolition laws in the Americas. By 1804 (including, New York (1799), New Jersey (1804)), all of the northern states had abolished slavery or set measures in place to gradually reduce it.
At the start of the Civil War, there were 34 states in the United States, 15 of which were slave states. ~Wikipedia
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It got California admitted as free soil, on condition that two other states could be admitted as slave-states.
Because if there were to be moe slave states than free states than one may rule at another and later on it will take over and have more control. Therefore, it was IMPORTANT to have the same number of free and slave states...without this we may have been either a free or a slave sate for the rest of our life...or until a president will decide to end it..along wih the congress.
it didnt
It was delayed because the issue of Slavery and to balance whether it should be a free or slave state.
The "Border States" were slave states.