World history ancient civilizations quizlet

No one knows, however, what delivered the final deathblow. To make matters worse, the market collapsed for the Viking GreenlandersвЂ™ main export: walrus ivory. The onset of the Little Ice Age in the 14th century was almost certainly a contributing factor, as it clogged the route in and out of Greenland with sea ice and shortened growing seasons on what were already highly marginal lands. 1400 and that the Eastern Settlement was abandoned a few decades later. AnasaziДЄrcheologists have since determined that the Western Settlement failed around A.D. Other factors, such as earthquakes or outbreaks of malaria or cholera, may have also played a role. Recent research instead suggests that the monsoon cycle essentially stopped for two centuries, making agriculture nearly impossible. Originally, scholars believed that an Aryan invasion from the north brought about the Indus collapse, but that theory is no longer in vogue. The population abandoned the cities and purportedly migrated to the southeast. They also developed a writing script thatвЂ™s still yet to be deciphered, and their cities contained sanitation systems that remained unequaled until Roman times.ДЄround 1900 B.C., however, the Indus, also known as the Indus Valley or Harappa civilization, went into freefall. By the third millennium B.C., they occupied over 386,000 square miles of territory-much more than their better-known contemporaries in Egypt and Mesopotamia-and accounted for an estimated 10 percent of the worldвЂ™s population. The Indus began building settlements in present-day India and Pakistan as early as 8,000 years ago, making them one of the earliest civilizations.

World history ancient civilizations quizlet