Kennedy most likely uses the clause "beachhead of cooperation may push back the jungle of suspicion, to convey the following idea.
Troops that land on the beach will overcome enemies hiding in the jungle,
O Suspicion is likely to choke the efforts of any cooperation.
Cooperation is the first step in lessening misunderstanding between adversarial nations.
Peace will be preserved by pushing back against enemies.

tenochtitlan (also spelled tenochtitlán), located on an island near the western shore of lake texcoco in central mexico, was the capital city and religious centre of the aztec civilization. the traditional founding date of the city was 1345 ce and it remained the most important aztec centre until its destruction at the hands of the conquering spanish led by hernán cortés in 1521 ce, which led to the final collapse of the aztec empire.

im not sure on this one

bipartisan basally means two groups of people who dont agree with each other (republican and democrat) make an agreement or work with each other

answer; (c) slaves brought to the americans from africa;