Barack Obama has become the 44th President of the United States, taking the oath of office on the steps of the U.S. Capitol before a crowd of more than one million people who had gathered in frigid temperatures to see the first African American become president. Immediately after President Obama took the oath of office, a military color guard fired off a 21-gun salute as an enormous and diverse crowd cheered, waved American flags and chanted the new president’s name.