No states joined the Confederacy during the month of March 1861. Seven states joined the Confederacy prior to March 1861 and four more after that.
The state of Missouri did join the confederacy in 1861.
Texas joined the Confederacy in 1861
in 1861 when his home state of Virginia seceded from the Union
1861
Texas joined the Confederacy on March 2, 1861 after seceding from the Union a month earlier.
1861
On January 9, 1861 Mississippi became the second southern state to declare its secession from the United States of America. On February 4, 1861 it joined with six other southern states to form the Confederacy.
Houston, who was governor of Texas at the time, opposed the state's decision to secede from the United States and join the Confederate States of America in 1861. He was removed from office on March 16, 1861 because he refused to take a loyalty oath to the Confederacy.
No, it didn't. Arkansas joined the confederacy on May 6, 1861, while the hostilities started on Apr.12, 1861.
On January 10, 1861, Florida delegates, who were meeting in Tallahassee, the state capital, voted to secede from the U.S. With that action, Florida became one of the original 6 states to secede from the U.S. and form the Confederacy. (A factoid from America's Library.)
It joined the CONFEDERACY in June 8, 1861.
Virginia