The major geographic barrier to westward expansion during the colonial period was the Appalachian Mountains. They extend from Newfoundland and Labrador in Canada to central Alabama and serve as barriers between the tidewater region or eastern coastal plains and the extensive interior lowlands of North America.
D. possinly A.
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I believe the correct answer is B.
Decolonization (US) or decolonisation (UK) is the undoing of colonialism, where a nation establishes and maintains its domination over dependent territories. The Oxford English Dictionary defines decolonization as "the withdrawal from its colonies of a colonial power; the acquisition of political or economic independence by such colonies."[1] The term refers particularly to the dismantlement, in the years after World War II, of the colonial empires established prior to World War I throughout the world. However, decolonization not only refers to the complete "removal of the domination of non-indigenous forces" within the geographical space and different institutions of the colonized, but it also refers to the "decolonizing of the mind" from the colonizers' ideas that made the colonized feel inferior
