Congress of the Confederate States and Kentucky were admitted into the Confederate States of America, requiring offensive military decisions otherwise uncalled for in the western theater, including violating Kentucky's neutrality. Their admission also provided a solid two-state delegation support amounting to 17% of the House and 15% of the Senate backing the Jefferson Davis government throughout the existence of the Confederacy. Treaties with the Five Civilized Tribes also allowed for their seating non-voting representatives in the Confederate Congress, as did the Territory of New Mexico. With the short-lived claim to the far western Arizona Territory, by the end of 1861 the Confederacy had gained the
Confederate States of America war, following the November 1860 election of Republican candidate Abraham Lincoln to the U.S. presidency on a platform which opposed the expansion of slavery into the western territories. Before Lincoln took office in March, a new Confederate government was established in February 1861, which was considered illegal by the government of the United States. States volunteered militia units and the new government hastened to form its own Confederate States Army from scratch practically overnight. After the American Civil War began in April, four slave states of the Upper South—Virginia, Arkansas, Tennessee, and North Carolina—also declared their secession and joined the