'memorial day' photo (c) 2007, Pawel Loj - license: https://creativecommons.org/licenses/by/2.0/

Here are a few final additions to The Best Websites For Learning About Memorial Day:

How African-Americans in South Carolina invented Memorial Day is from Vox.

Sacrifices Set in Adorned Stone is a photo gallery from The New York Times.

A Real Story of Memorial Day is from The Atlantic.