Montana. Montana is a landlocked state in the Mountain West subregion of the Western United States. It borders Idaho to the west, North Dakota to the east, South Dakota to the southeast, Wyoming to the south, and the Canadian provinces of Alberta, British Columbia, and Saskatchewan to the north. It is the fourth-largest state by area, but the eighth-least populous state and the third-least densely populated state. Its capital is Helena, while the most populous city is Billings. The western half of the state contains numerous mountain ranges, while the eastern half is characterized by western prairie terrain and badlands, with smaller mountain ranges found throughout the state. Most of Montana first came under American sovereignty with the Louisiana Purchase from France in 1803 and was explored by the Lewis and Clark Expedition shortly thereafter. Fur trappers followed and were the main economic activity in the area until gold was discovered in 1852. The ensuing gold rush, along with the passage of the Homestead Acts in 1862, brought large numbers of American settlers to Montana. Rapid population growth and development culminated in statehood on November 8, 1889. Mining, particularly around Butte and Helena, would remain the state's main economic engine through the mid-20th century. Montana has no official nickname but several unofficial ones, most notably Big Sky Country, The Treasure State, Land of the Shining Mountains, and The Last Best Place. Its economy is primarily based on agriculture, including ranching and cereal grain farming. Other significant economic resources include oil, gas, coal, mining, and lumber. The health care, service, defense, and government sectors are also significant to the state's economy. Montana's fastest-growing sector is tourism, with 12.6 million tourists visiting the state each year. The name Montana comes from the Spanish word montaña, which in turn comes from the Latin word montanea, meaning mountain or more broadly mountainous country. Montaña del Norte was the name given by early Spanish explorers to the entire mountainous region of the west. The name Montana was added in 1863 to a bill by the United States House Committee on Territories for the territory that would become Idaho Territory. The name was changed by representatives Henry Wilson and Benjamin F. Harding, who complained that Montana had no meaning. When Ashley presented a bill to establish a temporary government in 1864 for a new territory to be carved out of Idaho, he again chose Montana Territory. This time, representative Samuel Cox, also of Ohio, objected to the name. Cox complained that the name was a misnomer given that most of the territory was not mountainous, and thought a Native American name would be more appropriate than a Spanish one. Other names, such as Shoshone, were suggested, but the Committee on Territories decided that they had discretion to choose the name, so the original name of Montana was adopted. For thousands of years, various indigenous peoples have inhabited the land that is now Montana.