Did Oregon enter the Union as a free state or a slave state?
Oregon entered as a Free State.
The Compromise of 1820 allowed for Missouri to enter the Union as a slave state if what state was allowed to enter as a free state?
The proposal of House Speaker allowed the Missouri Compromise of 1820 resolve the slave and free state problem facing the US Congress. His deal which was accepted, split part of Massachusetts, allowing for a new state, Maine to be created and as a free state. This allowed for slave vs free to be balanced as then Missouri could enter as a slave state.
What allowed Missouri to enter the union as a slave state in Maine to enter the union as a free state?
The Slave vs. Free State debate. Missouri wanted to enter the union as a slave state, but naturally the Northerners, who opposed slavery, didn't want those who supported slavery to have more power. Thus the Missouri Compromise was drafted. It stated Missouri could enter as a slave state if Maine could enter as a free state.