https://churchandfamilylife.com/podcasts/6540dea48035f112bf38cdf8
Modern Thanksgiving was born out of the US Civil War – In
1863, Lincoln wanted the country to be thankful for the turning of the tide
post-Gettysburg and following his lead the government issued proclamations in
the 1870's.
In 1939 FDR moved the date up a week wishing to extend the
Christmas shopping season – and this remains the practice today.
In other words it's a familiar theme to us even today – it's
about the troops and the consumerist economy.