The United States refused to enter into an international conflict
(Isolationism is a country staying out of business between other countries, and the US was isolating itself from the war between other countries)
Following the attack of the Gulf of Tonkin, President Lyndon Johnson had been made allowed to conduct military operations in the region without a declaration of war being placed. This was allowed after congress passed the 'Southeast Asia Resolution'.
I think, it's really hard to diminish the violent behavior in the current generation. The only way for African people to prevent violence and civil war is to create a strong law enforcement within the government and impose heavy punishment to the violent groups. Then, they should start to improve the quality of education to develop the young minds of Africa so they became a better generation than their previous one.
Hope this helps
To get the south to end slavery and get back to the north