Answer:
The options are
a.sovereignty and expansion
b.imperialism
c.isolationism
d.cold war
The answer is a.sovereignty and expansion
Step-by-step explanation:
Alaska was formerly part of the Russian colony. The United State bought Alaska for 7.2million dollars from the Russians in 1867.
During this period the United State was expanding and Hawaii was also annexed to them.
These actions represented a sovereignty and expansion of the United State.