The correct answer to this open question is the following.
The United States worked to preserve a non-communist regime in South Vietnam in the time following the 1954 Geneva Accords in the following way.
It is important to mention what the context was. Following the Geneva Accords of 1954, the territory of Vietnam was divided at the 17th parallel into communist-controlled North and non-communist South.
This created a lot of tension and conflicts between the two Vietnams.
The United States worked to preserve a non-communist regime in South Vietnam supporting the government of South Vietnam and sent it supplies, weaponry, and military support to instruct the army of that country.
The Soviet Union was doing the same, supporting the government of North Vietnam, It was a complex time during the Cold War years, in which the Soviet Union tried to spread Communism in many parts of the world, including Vietnam, and the United States was applying the foreign policy of containment to stop Communism.
Regarding the economic decline of the Ottoman Empire, what happened was that the Ottoman Empire succumbed to inflation. The affluence of precious metals in the European market that were exported from North American. There was also an imbalance of trade that hit hard on the economy, combined with internal riots and rebellions that impacted the political stability of the empire.
