WARSAW, Poland — President Barack Obama, who had pledged to end America's wars, described the landscape that he was leaving to his successor as a state of quasi-war that could extend for years to come. Obama, who was speaking on Saturday to reporters at the NATO summit here, noted with pride that he has cut the size of the U.S. forces in Iraq and Afghanistan from 180,000 troops to less than 15,000. But U.S. drones and fighters jets are striking targets in seven countries on a regular basis, a span of geography that is virtually unprecedented in American history outside of major wars. U.S. Special Operations forces are still conducting dangerous raids in countries like Iraq, Afghanistan and...