“Besides Nevada, California, Colorado, Hawaii, Oregon, Utah, Vermont and Washington have already approved mass mail-in voting, as has Washington, DC. Most other states allow people to request ballots to avoid COVID-19 exposure while voting.”
Don’t know about the other states but Colorado has voted by mail since 2013.
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Is it absentee voting, or is a ballot sent without a request to every registered voter?
Absentee, I voted in person in 2016. I didn't automatically get a ballot.