Aztecs built chinampas ('floating gardens') in order to provide additional farm lands (answer C). The idea was to grow crops in small rectangular areas (ci. 30 x 2.5 m) on shallow lake beds. Aztecs began to use chinampas in Tenochtitlan in about 1250 AD.
The Cuban Missile Crisis transformed North Korea’s relations with Moscow and Beijing and nudged the country down a path of unsustainable military buildup that, in part, resulted in a nuclear weapons program and was responsible for the country’s economic difficulties in later decades.
They were awarded based on the spoils system
The spoils system was the idea that the victor takes the spoils of war, that is, the person who won the presidency can fire all employees that don't support him and put his own people into positions of power in federal agencies and organizations. After that, the merit system was introduced that ended this corrupt practice.
He instilled a sense of fear that the United States was
being infiltrated by Communists. Due to
his campaigns to root out evil, many innocent people were either put out of
work, jailed or executed because they were suspected of being communist
sympathizers or spies.
