Fort Sumter was held by the Federal Government or the Union. South Carolina had seceded and led the attack on Fort Sumter, that was located in the harbor of Charleston. The Union surrendered as they were outmatched. The South had its first victory. The deadliest of all U.S. wars had just begun. http://www.nps.gov/fosu/index.htm
A convention was held to discuss the possibility of Texas seceding from the United States beginning on January 28, 1861. It was overwhelmingly approved, and Texas was now part of the Confederate States of America. They were the 7th state to secede from the Union http://www.tshaonline.org/handbook/online/articles/mjs01