The time when humans first arrived in western hemisphere occurred far before humans understand the concept of numbers and writings. Since there's no physical evidence to rely on, it is impossible for Archeologists and Historians to determine an exact date.
In the end, all they can do is predict the time period.
Based on the estimation of how old the artifacts / architectures that they found. they predicted that human arrived in western hemisphere around 29,000 to 57,000 years ago.
The statement that best describes the political structure of the ancient Mayas is that "The Maya civilization was ruled by an emperor and had about four hundred tribute states." Paying tribute included giving gold or human sacrifice victims to a larger, more powerful empire
A communist government took power at the end of World War Two. ... East Germany was part of the Soviet zone of occupation agreed at the Yalta Conference and in 1945 the Soviets set up a communist regime.
After 36 years in existence, the Warsaw Pact—the military alliance between the Soviet Union and its eastern European satellites—comes to an end. The action was yet another sign that the Soviet Union was losing control over its former allies and that the Cold War was falling apart.
