It was a very deadly war--the Great War produced new forms of guns, bombs, and gas weapons which proved to be devastating.
The Great War, World War I, saw the emergence of tanks, rapid fire machine guns, grenades, mustard gas, and well as airplanes. The method of trench warfare in addition to highly accurate and deadly weapons led to both large numbers of causalities and stalemates. These weapons made it difficult to move position causing need for new techniques or new technology to allow movement.
The United States advanced an open-door policy to promote free and open trade in China. The Open Door policy was an international trade agreement between the United States and several foreign nations over trade with China.
The ensuing Mexican–American War was waged from 1846 to 1848 with the loss of many thousands of lives and the loss to Mexico of all of its northern provinces.
