Barack Obama served as the 44th President of the United States. Inaugurated before an estimated crowd of 1.8 million people, Obama proposed unprecedented federal spending to revive the economy and also hoped to renew America’s stature in the world. During his first term he signed three signature bills: an omnibus bill to stimulate the economy, legislation making health care more accessible and affordable, and legislation reforming the nation’s financial institutions. Obama also pressed for a fair pay act for women, financial reform legislation, and efforts for consumer protection. In 2009, Obama became the fourth president to receive the Nobel Peace Prize.

In 2012, he was reelected over former Massachusetts Governor Mitt Romney by 332 to 206 electoral votes. The Middle East remained a key foreign policy challenge. Obama had overseen the killing of Osama bin Laden, but a new self-proclaimed Islamic State arose during a civil war in Syria and began inciting terrorist attacks. Obama sought to manage a hostile Iran with a treaty that hindered its development of nuclear weapons. The Obama administration also adopted a climate change agreement signed by 195 nations to reduce greenhouse gas emissions and slow global warming.