President Joe Biden has said he is hopeful that America can “mark independence” from Covid-19 on 4 July if people get vaccinated.
In his first primetime address as president, Mr Biden said he would order states to make all adults eligible for vaccinations by 1 May.
Current measures prioritise people by age or health condition.
Mr Biden was speaking exactly a year to the day after the outbreak was classified a global pandemic.
Half a million Americans have since died – more than the death toll from World War One, World War Two, and the Vietnam War combined.
Schools have been closed, businesses shuttered and people kept apart.