What year did Alabama secede from the union and join the confederacy?
Answer The US capitol was in Washington, D.C. The capitol of the Confederacy was originally in Montgomery, AL. However, Virginia was debating if they would secede and join the Confederacy. Somehow, the offer was made to move the Confederate capitol to Richmond in order to entice the State to join. Virginia seceded from the Union. General Robert E. Lee followed the decision of his State. The Capitol was moved to Richmond.
When the confederacy was formed, the current Texas governor felt his troops were best served by fighting Native American wars and refused to send any troops to the East to fight in the confederacy. However, after he left office, Texas joined. Kentucky and Missouri refused to secede from the Union but rump groups declared secession.
At the beginning of the Civil War the State of Virginia voted to secede from the Union, but many of the the people in what is now West Virginia were loyal to the Union and did not want to join the Confederacy, so they split off from the rest of Virginia and they officially became a state on June 20, 1863.
South Carolina did not rejoin the Union until after the Civil War. South Carolina was the first state to secede from the Union in 1860 and it was the capitol of the Confederacy. At the same time the ports were also being used by the North to supply troops gearing up in the South. South Carolina also became a state where the slaves could join the Union Army.
I don't think there was a state with exactly 48 counties that joined the Union. West Virginia with 55 counties broke off from Virginia and joined the Union. 28 counties in Tennessee, mostly in the eastern part of the state supported the Union. Various counties in other Confederate states where plantations did not dominate the economy also supported the Union or at least felt opposed to secession.
Lincoln reasoned that the union created by the Constitution must remain intact. While the southern states claimed they had the right to secede, and that might have been true, the Constitution did not allow them to join any league or confederacy besides the United States of America. Thus, he argued, the existence of a Confederacy was in direct violation of the US Constitution.