Fighting between the United States and Mexico started. They fought over what was to become the Southwestern United States and who could own this land. This was called the Mexican-American War. The war ended in an American victory in 1848. Nevada later became an American territory in 1861. It was called the "Nevada Territory". This was not all of Nevada as it is today. The eastern part of Nevada was part of "Utah Territory" and the southern part was part of "New Mexico". In 1859 in the Comstock Lode, gold and silver were first discovered. This started a huge growth in mining in the state which Nevada is known for.