<span>The answer usually given is containment of the USSR i think
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In North America in the parts north of the present day Mexico, the First Nations had climatically a more hostile environment to deal with than their counterparts in the now Mexico and Mesoamerica and South America. The winters on the Great Plains and in the now Canadian north were harsh and did not favor large populations to develop (with some exceptions like in British Columbia, Canada which had a mild climate and in which 100's of 1000's of First Nations lived). So the mainly plains Indians had a nomadic existence following the game and fish and so had a more egalitarian less centralized leadership than their counterparts to the south. In Mexico, Mesoamerica and South America, the climate was generally less harsh, and fairly large scale agriculture was practiced and the people were more sedentary and political power was held in the hands of rulers who though they had henchmen, tended to be all-powerful, though the Incas for example had a quite equitable system of compulsory labour for public works and mines, allowing time for the participants to work their own fields to sustain their families.
The correct answer is d. Egypt and Syria launched a surprise attack against Israel.
The Yom Kippur/Ramadan war was an armed conflict between Israel and the Arab nations of Egypt and Syria in October 1973. The conflict initiated when the coalition of Egypt, led by the president Anwar Sadat, and Syria, led by the president Hafez Al-Asad, launched a surprise attack against Israel during the Yom Kippur holiday, which that year happened to be also during the Islamic sacred month of Ramadan. The goal for the Arab nations was to recover Arab territories that were lost in previous wars against Israel: the Sinai for Egypt and the Golan Heights for Syria.
John Tyler was the first VP to become president after the death of William Henry Harrison.