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This is not correct. "Americans today can trace their ability to vote by mail to the soldiers who deployed to Europe during the World Wars, according to Alex Keyssar, a history professor at the Kennedy School of Government at Harvard University" https://www.nbcnews.com/politics/2020-election/how-do-you-know-voting-mail-works-u-s-military-n1186926 https://twitter.com/realDonaldTrump/status/1275062328971497472
"In World War I, lawmakers began to expand the absentee voting system setup for soldiers overseas to Americans serving the greater good away from home, such as railroad workers... war has been responsible for many of the big advances in voting rights" https://www.nbcnews.com/politics/2020-election/how-do-you-know-voting-mail-works-u-s-military-n1186926
"The history of absentee voting in the United States is the history of its major wars, when large numbers of Americans were away and politicians back home wanted to make sure they weren't disenfranchised." This is traced all the way back to Abraham Lincoln https://www.nbcnews.com/politics/2020-election/how-do-you-know-voting-mail-works-u-s-military-n1186926
"By World War II, every state let soldiers vote remotely and the military was responsible for about 3.2 million absentee ballots cast, which amounted to nearly seven percent of the total electorate in the 1944 presidential election" https://www.nbcnews.com/politics/2020-election/how-do-you-know-voting-mail-works-u-s-military-n1186926
