Who was the first African American president of the United States?

Barack Obama holds the distinction of being the first African American president of the United States, having served two terms from 2009 to 2017. His election was a significant historical milestone, reflecting progress in racial equality and the civil rights movement in the United States. Obama's presidency was marked by notable policies such as the Affordable Care Act, efforts to address economic recovery during the Great Recession, and advancements in areas such as climate change and foreign diplomacy. His election also symbolized a breaking of barriers and provided a source of inspiration for many Americans, showcasing that leadership in the highest office was attainable for individuals from diverse backgrounds.

The other individuals listed have made remarkable contributions in their respective fields; however, they did not serve as president. Colin Powell was a prominent military leader and the first African American Secretary of State, George Washington Carver was an influential agricultural scientist and inventor, and Martin Luther King Jr. was a pivotal civil rights leader advocating for nonviolent activism. Each played critical roles in American history, but none were elected as president.