sentences:  Nebraska's constitutional convention voted against statehood, while voters in Colorado rejected the proposed state constitution, so of those three territories, only Nevada became a state during Lincoln's presidency.It did so on October 31, 1864.The U.S. and the CSA both recognized the potential importance of foreign powers in the Civil War, as a European intervention could greatly aid the Confederate cause, much as French intervention in the American Revolutionary War had helped the United States gain its independence.