Because the US had build boats, ships, and airplanes. Troop support was a main one. And we were allies with Great Britain , and The Soviet Union.
A. Through votes in their legislatures and conventions
The two results that the United States Involvement of 1961 provided to Vietnam are actually two. First, the treaty provided military aid in order to boost its manpower. Second, it's economical aid in order for the country to progress further.
It is called the Yangtze river and it is known as the golden waterway because it is the longest river of Asia