fuel such as coal, oil, or natural gas formed underground from plant or animal remains

tall towers that support, or hold up, oil-drilling equipment

factory where crude oil, or oil in its natural form, is refined, or changed into usable products such as gasoline

a clean burning gas found in nature that can be used as a fuel

towns that grow along with economic booms, or times of fast growth

the giving of money or gifts for charity, or things that help people

railroad that runs across the continent

farming techniques, such as terracing, used in a dry climate to keep moisture in the soil

growing crops on very large farms in order to sell them and make a profit

when workers refuse to do their job until a company meets their demands

marks put on cattle, made with a burning hot iron symbol, that show who the cattle belongs to

breed (type) of cattle with long horns that developed as Spanish breeds mixed with English cattle brought by U.S. settlers

cattle trail from the Rio Grande valley in South Texas to Kansas used to reach rail lines for shipping cattle

cattle trail that went across the open range to the west of settled territory and into Dodge City, Kansas