Bush’s successor, Barack Hussein Obama, aimed to turn the page in both domestic and foreign policy. He achieved major health care reform and some antirecession measures, but a determined grassroots movement on the Republican right pushed the party to oppose the president at every turn. In foreign policy, Obama generally sought a less aggressive, more multilateral approach to challenges around the world. His administration reopened diplomatic relations with Cuba in 2015 and negotiated a treaty with five major powers and Iran to keep that nation from developing nuclear weapons. But most of the Middle East remained an unstable and dangerous place, and the United States seemed increasingly vulnerable to terrorist threats.