When he took office as the 46th US president, Joe Biden declared that his ascension was the "triumph not of a candidate, but of a cause - the cause of democracy". Speaking to a divided country in the midst of a pandemic, just weeks after the Capitol riot, he vowed to bring back unity and do "great things". "We can right wrongs. We can put people to work in good jobs. We can teach our children in safe schools. We can overcome this deadly virus," he said. A year into his presidency, we take a look at what progress Mr Biden has made, his standing with the American public, and what it all means for the president going forward, with analysis from the BBC's North America correspondent Anthony Zurcher. How are Mr Biden's approval ratings? Despite a bitter presidential race, Mr Biden began his term with 56% of the country approving of his performance, according to RealClearPolitics, and having won more than 80 million votes - more than any other president. But in his first year, he has had a startling reversal of fortunes. Today, his approval has sunk to 42%. The number of people who disapprove of the job he's done has risen from 35% to 52%. You can even pinpoint the exact moment Mr Biden's star fell - amid a widely criticised withdrawal of US troops from Afghanistan in August, 2021. That was when the proportion of people who disapproved of him was about equal to the proportion who approved. Since then, his approval ratings have fallen further as he has struggled to deliver on his biggest campaign promises to tame the Covid-19 pandemic and restore prosperity for the middle class. Compared to other recent presidents, only Donald Trump has had a more disappointing first year - his approval rating fell from 45% on his inauguration day to 35% a year later, according to historical trends by Gallup. Mr Biden's former boss, Barack Obama, began at a high of nearly 70% when he took office and ended close to 50% a year later. George W Bush began his first term in a similar position to Mr Biden, with approval around 60%, but that rose to nearly 90% after 11 September, 2001. Anthony Zurcher: It's hard to say that the honeymoon is over for Joe Biden because he never really had a presidential honeymoon. His ratings started modestly positive, without the kind of big inaugural bump most presidents (not named Donald Trump) receive. Now his numbers are in the danger zone for first-term presidents hoping to win re-election - a reflection of near universal Republican dislike and a majority of independents who are souring on him.