Civil War broke out on April 12, 1861 when separatists attacked US forts, including Fort Sumter in Charleston, South Carolina. The Confederacy expanded to include eleven additional states. And it claimed two border states , and the Indian territories and southern parts of the western lands of Arizona and New Mexico joined and fell under the Confederation to become the Arizona Confederation. The US government has not recognized the Confederacy diplomatically, nor has it been recognized by any foreign country . The states that remained loyal include the border states in which slavery was legal, and are known as the Union or the North. In the spring of 1865 the war ended with the surrender of all Confederate armies and the dissolution of the Confederate government.