For as long as humans have been roaming, there have been disputes and wars between tribes, territories, etc

With the increase in weapons of mass destruction and exponentially increasing army strength, the effects of war are being felt at a global scale compared to when it was simply bows and arrows and spears and knives. And with globalization and the invention of planes and oversea ships, tankers, submarines, it becomes so much easier to initiate cross continental war. Transportation continues to only get better and stronger and more funding is being put into the army and military services so no, I don't think the human race will ever reach a point where war is obsolete.