Which concept can be considered a policy of expansion?
a) manifest destiny
b) temperance
c) abolitionism
d) populism

   A) Manifest Destiny

Explanation:  Manifest Destiny is a political doctrine or belief from nineteenth century, more precisely, this phrase was coined in 1845, that the United States has a divine mandate to expand to the entire North American continent. Given that it is a divine mandate that entitles the United States to this right, this expansion is justified and inevitable, as a need for the spread of democracy, capitalism and human rights.

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explanation:

bismarck believed in using force

is the correct answer!