Barack Obama served as the 44th President of the United States from 2009 to 2017. He was the first African American to hold the office and was a member of the Democratic Party. His presidency focused on several key issues, including healthcare reform, economic recovery following the 2008 financial crisis, and climate change. One of Obama's significant achievements was the passage of the Affordable Care Act, which aimed to expand healthcare coverage for millions of Americans. He also emphasized diplomacy in foreign policy, notably through the Iran Nuclear Deal and the re-establishment of relations with Cuba.