None, Maine was the only state to join the union in 1820.
Oregon entered as a Free State.
Missouri entered the union as a slave state, Maine entered the union as a free state, it was compromised that there would be no more slave states above the 36th parallel(Missouri was to be the only exception)
maine entered the union as a slave state
Under the provisions of the Missouri Compromise, Maine was the state that entered the Union with Missouri.
Arkansas entered the Union as a slave state on June 15, 1836.Arkansas was admitted to the Union on June 15, 1836 becoming the 25th state to join the Union.
Maine entered the union as a free state. Under the Missouri Compromise of 1820 Missouri was admitted as a slave state and Maine as a free state.
Maine became the 23rd state on March 15, 1820. Its admission to the Union balanced the simultaneous admission of Missouri as a slave state.
Michigan was a free state, and stayed in the Union.
Free; as it entered in 1896. Almost 30 years after the ending of slavery in the US.
That's exactly what happened, as specified by the Missouri Compromise of 1820!
Maine entered the US as a free state. The state was carved out of territory ceded from Massachusetts. This was part of the 1820 Missouri Compromise. This act allowed Missouri to enter the US as a slave state. In order to keep the balance between free and slave states intact. And, so Maine was created as a free state.