The settlement of the Americas is widely accepted to have begun when Paleolithic hunter-gatherers entered North America from the North Asian Mammoth steppe via the Beringia land bridge, which had formed between northeastern Siberia and western Alaska due to the lowering of sea level during the Last Glacial Maximum.
I am pretty sure it is C. shortening sea voyages between industrial centers and foreign markets. i also suggest going to Jiskha.com and it will answer most questions without points. just type in the question and get the answer :)
Kennedy’s close advisers believed that Eisenhower’s foreign policy establishment was stultified, slow moving, overly reliant on brinksmanship and massive retaliation, and complacent. Their fear was that after eight years, the State Department would be unable to implement their new international vision. The new President was determined to control foreign policy through a young and energetic White House and NSC staffers who would make their own informal contacts within the foreign affairs bureaucracy. Furthermore, Kennedy thought that Eisenhower and Secretaries Dulles and Herter had all but ceded the newly emerging states in Latin America, Asia, and Africa to the communists.