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This river may predate the break-up of western Gondwana as an extension of a proto-Congo river system, 200 Mya during the Jurassic. Ohio: 3~2.5 Mississippi River: Formed when the Laurentide Ice Sheet dammed the north flowing Teays River during the Pre-Illinoian glaciation. The drainage area of the Teays could no longer drain to the north, and ...
During the ensuing Pennsylvanian, the northward drift of Gondwanaland finally joined the southeastern United States to North America as Pangaea began to form. Mountain building raised the Ancestral Rockies in Colorado, Utah, and Wyoming. Seawaters left the interior of the country. [31] Densely vegetated swamps were widespread. [32]
An eruption of Laki, in Iceland, was responsible for up to hundreds of thousands of fatalities throughout the Northern Hemisphere (over 25,000 in England alone), and one of the coldest winters ever recorded in North America, 1783–1784; long-term consequences included poverty and famine that may have contributed to the French Revolution in 1789.
At times, the ice sheet's southern margin included the present-day sites of coastal towns of the Northeastern United States, and cities such as Boston and New York City and Great Lakes coastal cities and towns as far south as Chicago and St. Louis, Missouri, and then followed the present course of the Missouri River up to the northern slopes of ...
A river valley civilization is an agricultural nation or civilization situated beside and drawing sustenance from a river. A river gives the inhabitants a reliable source of water for drinking and agriculture. Some other possible benefits for the inhabitants are fishing, fertile soil due to annual flooding, and ease of transportation.
Exceptional precipitation absence in northern hemisphere exacerbated by human activities [citation needed] causes the Dust Bowl drought of the US plains and the Soviet famine of 1932–1933 (harsh economic damage in US and widespread death in USSR). 1939 1945 World War II, with heavy bombardment, genocide, and explosions.
His map covers the entire world in a double hemisphere projection. This map follows shortly after the explorations of Captain Cook in the Arctic and Pacific Northwest, so the general outline of North America is known. However, when this map was made, few inland expeditions had extended westward beyond the Mississippi River. [55]
The longest river in Alaska and Yukon, it was one of the principal means of transportation during the 1896–1903 Klondike Gold Rush. A portion of the river in Yukon—"The Thirty Mile" section, from Lake Laberge to the Teslin River—is a national heritage river and a unit of Klondike Gold Rush International Historical Park.