German scientist Alfred Wegener (1880-1930) first proposed the theory of continental drift in 1912, but it was not widely accepted until the 1950s.
Kennedy created NASA, and spent billions of dollars on expirements and production and training of astronauts and rockets/space shuttles/stations
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Trench warfare is a type of land warfare using occupied fighting lines largely comprising military trenches, in which troops are well-protected from the enemy's small arms fire and are substantially sheltered from artillery.
The abundance of natural resources
Specific issues
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