Though the united states acquired alaska in 1867, this action best represents the period of foreign policy in which the acquisition of land to expand united states territory was a priority.
a. sovereignty and expansion
b. imperialism
c. isolationism
d. cold war

Though the United States acquired Alaska in 1867, this action best represents the "a. sovereignty and expansion" period of foreign policy in which the acquisition of land to expand United States territory was a priority, since the US became "sovereign" over the land it acquired. 

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