Manifest Destiny is the belief that Americans were destined to expand across North America from coast to coast.
The Emancipation Proclamation is an executive order by Abraham Lincoln freeing the slaves.
The Monroe Doctrine was a United States policy of opposing European colonialism into the Americas.
Lastly, The Louisiana Purchase was the purchase of the Louisiana territory by the US from France.
Manifest Destiny is the best answer.
Answer:
To try to strengthen the Soviet economy
Explanation:
The Soviet's didn't surrender to America. They called for peace after the US started shifting its relations to China. USSR felt threatened and eventually they both agreed to cut on weapons.