President Joe Biden made the vow at a virtual Covid-19 highest point uninvolved of the UN General Assembly, encouraging an "arms stockpile of immunizations".
The extra hits will see the complete US responsibility on immunization sharing surpass one billion punches.
Specialists say exactly 11 billion dosages are needed to immunize basically 70% of the worldwide populace.
The World Health Organization has set a base objective of 40% immunization inclusion in each country before the finish of 2021.
Yet, the objective is probably not going to be met.
While some top level salary nations have now offered something like a single chance to the greater part their populaces, just 2% of individuals in low-pay nations have had their first portion, as indicated by information from the University of Oxford.
So what's diverse at this point? Indeed, worldwide creation has gotten in the beyond couple of months and there are dosages accessible.
Rich nations could have 1.2bn extra portions before the year's over, regardless of whether they run promoter crusades, as per science investigation firm Airfinity. 241m of those could go to squander in case they're not given. Be that as it may, these should be sent very soon.
Covax, the WHO-supported plan to assist with disseminating immunizations reasonably, has told the BBC that an excessive number of the gifts it's getting have come in little amounts, without a second to spare and with brief period left before they lapse.
That makes their work of getting them to where they are required extremely hard. Assuming Biden need to meet this yearning objective of immunizing the world around this time one year from now, that should change.
The White House's Covid highest point comes as exploration shows rich nations are as yet holding excesses of immunizations, a considerable lot of which could before long be tossed out.
In June, individuals from the G7 - Canada, France, Germany, Italy, Japan, the UK and the US - vowed to give one billion dosages to helpless nations over the course of the following year.
President Biden promised 580m at that point, of which the US has conveyed just 160m up until now.
The gave immunizations are steered through Covax, the worldwide plan upheld by the WHO to get portions where they're required most.
Covax buys and afterward offers immunizations for minimal expense to center pay nations and gives to helpless nations.
In the US - where over 76% of grown-ups have gotten somewhere around one portion - analysis that the nation is doing too little to even think about aiding the remainder of the world has developed.
On Friday, a board prompting the US Food and Drug Administration (FDA) suggested sponsor shots - third portions - of the Pfizer immunization for individuals 65 and over.
The WHO has recently approached more well off countries to hold off on giving promoters until inoculation rates go up in lesser created nations.
Last week, in a letter to Mr Biden, eight legislators of his own party stated: "Plainly, there is an unjust appropriation of Covid-19 antibody dosages, and it is deteriorating."