Did The Bush Regime Cause The World Instability We See Today?

Afghanistan, Iraq, Northern Africa are hot spots torn by war. Iran and Russia are saber rattling. What role is the United States playing in all this instability? UN Peace Keepers murdered in Sudan reportedly by forces aligned with the Govt and the U.S. claims they are a partner in the war on terror? Will Obama and McCain continued the Bush Regimes ridiculous prejudice foreign policy? Looks that way to me.