This map shows the shifting center of American population in the first two centuries of its existence. What might BEST account for this shifting trend?
A) The increased hurricane activity has created a westward migration.
B) The geographic land forms that once limited movement are no longer there.
C) The increased earthquake activity in the west created an eastward migration.
D) Advances in transportation and technology have made geography less of a limit to population distribution.

answer: ensure protection from communism

explanation:

the north atlantic treaty was largely dormant until the korean war initiated the establishment of nato to implement it, by means of an integrated military structure: this included the formation of supreme headquarters allied powers europe in 1951, which adopted the western union's military structures and plans.

the geography of greece

led to limited interactions with other cultures in the mediterranean

was rich in natural resources and led to repeated invasions from the macedonians

encouraged greater contact with peoples on the southern and eastern mediterranean coasts

caused the greeks to eventually relocate eastward under alexander the great