In my opinion, it was because the agricultural revolution mainly.
The correct answers are A) It accelerated migration to the West Coast and D) It added an additional slave state to the country.
The discovery of gold in California impacted western expansion in that it accelerated migration to the West Coast and it added an additional slave state to the country.
After the United States purchased the Louisiana territory in 1803, US President Thomas Jefferson ordered the exploration of the new territories with the Lewis and Clark Expedition. Two years later, both explorers delivered the results of their exploration and President Jefferson supported the occupation of those lands. So the westward expansion started. Thousands of people started to move west using the Oregon Trail to fulfill the Manifested Destiny.
The league of Nations, I believe.
Answer:
The Generalplan Ost
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The breakdown of the wartime alliance between the U.S. and the Soviet Union, then the responsible party for starting the Cold War would be the Soviet Union, because of the Soviet Union's wartime espionage program against the United States.