While many people are familiar with Las Vegas' nickname, Sin City, they might not be familiar with the state of Nevada's official slogan. Nevada is known as the Battle Born State because it acquired statehood in the middle of the country's deadliest conflict. Nevada joined the Union in 1864 during the Civil War. This was a strategic move by the Union as the new state only had one-fifth of the population required for statehood but contributed soldiers, money and vital Congressional support for Abraham Lincoln's anti-slavery amendments to the Constitution.