1. It was not a civil war, it was a war of independence. Croatia was a republic, it did not fight against their own people to characterize it as a civil war.
2. RSK (Republika Srpska Krajina) was offered autonomy by Croatia in "plan Z4", but they refused, so they were eliminated in operation "Storm", which was allegedly helped by Americans, but only in intelligence.
3. In Bosnia, Serbs were saved by Dayton agreement, because they were almost completely defeated by joint Croat and Muslim forces who came at the gates of Banja Luka, when the Americans said "STOP", because they were afraid of mass killing and revenge. So, the Republic of Srpska was saved on one side and Federation of Bosniaks and Croats on the other side. That was your result of diplomacy.
4. Please, try to be politically correct and sustain yourself from spreading lies.