The move catapults the world's richest person into a rarefied group of billionaire megadonors at a time when his company, Amazon.com, faces growing scrutiny over its rising power and impact on the economy.
Sawant is referring to the Seattle head tax that the Seattle City Council adopted and then repealed a month later.
He said "we have made tremendous progress" in the search but offered no clues, despite reports that Amazon board members had visited locations in the Washington suburb of Arlington, Virginia.
The Bezos Day One Fund will be made up of the Families Fund and the Academics Fund.
The Day 1 Families Fund will start an organisation to operate a new network of full-scholarship preschools for low-income communities. The most notable involving more than $40 million U.S. to the local nonprofit FareStart - a hospitality training program and restaurant business that aims to combat homelessness and poverty - and Mary's Place, whose mission to find and provide shelter for every child.
Amazon will select a location for its second headquarters by the end of the year, CEO Jeff Bezos said Thursday night. "Most important of those will be genuine, intense customer obsession".
Discussing the preschools he would be funding, Bezos said he would focus on children the way Amazon does its customers.
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His net worth has risen by US$64.7 billion this year alone as Amazon's shares surged.
The missive set off a frenzy of responses, including pleas to support health care, loan forgiveness and even offbeat appeals to back a leather fetish museum in Chicago.
The Bezos cash injection follows the philanthropic efforts of other billionaires including Microsoft's Bill Gates, who has donated tens of billions to his foundation.
Many in the philanthropic sector say they're glad that the world's richest man was directing some of his largesse a little closer to home. "They're still going to want a big selection".
These terms of endearment are all things Trump has said about the news media, most of which came out via his Twitter account.
But Bezos said he did not see Amazon - which briefly hit $1 trillion in market value - as a monopoly, arguing that online sales still represent a small fraction of overall retail.