Answer:
The Mongols developed a highly technological society that emphasized formal education. European monarchies became a model for the early Mongol governments. Pax Mongolia led to regional stability, increasing trade on the Silk Road. The Mongols adopted Roman Catholicism as the official religion of the empire.
D. The British Army thought it would be too challenging to fight across the Appalachian Mountains.
I think it would be the first answer because it makes more since
Assuming your question is in reference to the Vietnam War, the United States got involved because of
<h2>domino theory and the policy of containment.</h2>
"Domino theory" was applied in justifying US involvement in the Vietnam War. Domino theory said that the spread of communism in Vietnam would result in other countries in the region falling like dominoes to the influence of communism.
Domino theory was a corollary to the overall policy of containment that developed as the United States' policy regarding communism after the end of World War II. George F. Kennan is known for recommending the policy of containment, which said that the best way to deal with the threat of communism was simply to try to keep it contained to the places where it already existed.
They come together to advance a cause
