West Virginia - although there was very little slavery there.
West Virginia broke apart from the slave state Virginia and joined the Union, but for the most part all slave states were Confederate.
The state of Texas re-entered the union in 1870. The state first joined the union in December of 1845 but briefly joined the Confederate States of America in 1861.
Pennsylvania joined the Union as the second state on 12 December 1787
On June 1, 1796 Tennessee became the 16th state of the union.
principally in admitting Missouri, a slave state, and Maine, a free state, into the Union at the same time, and in regulating slavery in the former Louisiana Territory
a slave state
Missouri just joined the union as a slave state
I believe Mississippi
West Virginia broke apart from the slave state Virginia and joined the Union, but for the most part all slave states were Confederate.
Fifteen - eleven Confederate, four Union. District of Columbia was a slave-state for the first few weeks of the war, though slave-trading was illegal there. The new state of West Virginia was also a slave-state that had seceded from Virginia and the Confederacy, and joined the Union in 1863.
mAINE
Nope, Maine was also a anti-slavery state since the start of it's joining into the Union in 1820. Maine joined the Union from the Compromise of 1820. Missouri wanted to become a slave state, but in order to keep a balance between slave to anti-slave states, Maine was then admitted to the Union as a free state(Missouri Compromise of 1820).
Under the Missouri Compromise of 1820 Missouri was admitted as a slave state and Maine as a free state.
Delaware, Kentucky, Maryland, and Missouri were four slave states that did not secede from the Union. West Virginia, another slave state, seceded from Virginia and joined the Union during the Civil War. it was 4 that didn't secede from the union.
After ten years of independence Texas was still menaced by Mexico and the Commanche. Becoming a US State gave Texas added security. Also, Texas received the same rights as any US state at the time, and Texas was allowed to join the Union as a slave state.
No State joined the Union in 1880.
No State joined the Union in 1956.