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The Ogallala Aquifer (oh-gə-LAH-lə) is a shallow water table aquifer surrounded by sand, silt, clay, and gravel located beneath the Great Plains in the United States. As one of the world's largest aquifers, it underlies an area of approximately 174,000 sq mi (450,000 km 2) in portions of eight states (South Dakota, Nebraska, Wyoming, Colorado, Kansas, Oklahoma, New Mexico, and Texas). [1]
The history of water supply and sanitation is one of a logistical challenge to provide clean water and sanitation systems since the dawn of civilization. Where water resources, infrastructure or sanitation systems were insufficient, diseases spread and people fell sick or died prematurely. Astronaut Jack Lousma taking a shower in space, 1974.
List of World War II vessel types of the United States. This is a List of World War II vessel types of the United States using during World War II. This list includes submarines, battleships, minelayers, oilers, barges, pontoon rafts and other types of water craft, boats and ships. As of 2014 this list is not complete.
The history of coal mining in the United Statesstarts with the first commercial use in 1701, within the Manakin-Sabotarea of Richmond, Virginia.[1] Coal was the dominant power source in the late 1800s and early 1900s, and although in rapid decline it remains a significant source of energy in 2024.
Unit 731 (Japanese: 731部隊, Hepburn: Nana-san-ichi Butai), [note 1] short for Manchu Detachment 731 and also known as the Kamo Detachment [3]: 198 and the Ishii Unit, [5] was a covert biological and chemical warfare research and development unit of the Imperial Japanese Army that engaged in lethal human experimentation and biological weapons manufacturing during the Second Sino-Japanese War ...
The history of the United States from 1945 to 1964 was a time of high economic growth and general prosperity. It was also a time of confrontation as the capitalist United States and its allies politically opposed the Soviet Union and other communist states; the Cold War had begun. African Americans united and organized, and a triumph of the ...
September 16 – WWII: The Selective Training and Service Act of 1940 is signed into law by Franklin D. Roosevelt, creating the first peacetime draft in U.S. history. September 26 – WWII: The United States imposes a total embargo on all scrap metal shipments to Japan.
The history of agriculture in the United States covers the period from the first English settlers to the present day. In Colonial America, agriculture was the primary livelihood for 90% of the population, and most towns were shipping points for the export of agricultural products. Most farms were geared toward subsistence production for family use.