Did the us involvement in vietnam stop the spread of communism ? ?

No.

It was pointless for the US to fight in Vietnam as the North had communist aid and forced the US troops to retreat. The communist president was elected and the entire country was converted into a communist state.

Hope this helps!

How  did spanish  power increaseunder charles  v and philip ii? in 1519,charles  v inherited a huge empire. he became king of  spain  and was also the heir to the hapsburg empire. during his 42-year reign, philip worked to expand  spanish  influence, strengthen the catholic church, and make his own power absolute. hope this !