Democrat Joe Biden on Monday won the state-by-state Electoral College vote that formally determines the US presidency, all but ending President Donald Trump’s floundering campaign to overturn his loss in the Nov 3 election.

California, the most populous state, delivered its 55 electoral votes to Biden on Monday afternoon, officially putting the former vice president over the 270 votes needed to secure the White House. Based on November’s results, Biden earned 306 Electoral College votes to the Republican Trump’s 232.

Earlier in the day, electors in several major battleground states where Trump has unsuccessfully sought to reverse the outcome - Arizona, Georgia, Michigan, Nevada, Pennsylvania and Wisconsin - also voted for Biden, who is set to take office on Jan 20 alongside running mate Kamala Harris...