Joe Biden became the 46th president of the United States, vowing a "new day" for the United States after four years of tumult under Donald Trump who in an extraordinary final act snubbed the inauguration. He vowed to defeat political extremism and domestic terror in his first speech as US president. The US faces "a rise of political extremism, white supremacy, domestic terrorism, that we must confront, and we will defeat," he said in his inaugural address on the steps of the US Capitol. (Credit: Associated Press)