The Tang dynasty came to an end in 907 when a military commander Zhu Wen acquired throne after replacing The last Tang Ruler. He now came to known as Emperor Taizu. In 1214 when prince Zhao Xian took the command of the Song Dynasty, Mongols threat was at their door. This explains events in chronological order.
In 1947, President Harry S. Truman pledged that the United States would help any nation resist communism in order to prevent its spread. His policy of containment is known as the Truman Doctrine.
The Dawes Act of 1887 (also known as the General Allotment Act or the Dawes Severalty Act of 1887), authorized the President of the United States to survey Native American tribal land and divide it into allotments for individual Native Americans
