Free Comics - let me know if you have others to add!
https://classroom.popcultureclassroom.org/product/educational-comix-series/colorful-history/ This is created by Pop Culture Classroom - an amazing organization! I have written some of the lesson plans/teacher resources as well. These are based on people/events in US history - they can be used for any grade level.
All about the Federal Reserve - published by the Federal Reserve! https://www.newyorkfed.org/outreach-and-education/comic-books
WWII - How to Spot a Jap - http://www.ep.tc/howtospotajap/howto08.html - this horribly racist comic from the US War Dept was also published in USA newspapers.
1951 Civil Defense comic book - If an A-bombs Falls http://www.ep.tc/comics/a-bomb/
1954 Civil Defense comic book - The H bomb and You - http://www.ep.tc/comics/h-bomb/index.html
NASA comics - https://www.astrobio.net/nasa-astrobio-graphic-novels/
http://www.crmvet.org/docs/ms_for_comic.pdf - The Montgomery Story. This is a comic that was distributed during the US Civil Rights Movement and teaches the methods of non-violent resistance. MLK, Jr. helped edit it.
http://features.weather.com/us-climate-change/arkansas/ - Marshall Islands and climate change research. What will happen to the Pacific Islands as sea levels rise? Drawn by the amazing Nate Powell of March fame.
http://www.magictorchcomics.co.uk/blog - this includes an amazing comic on Gallipoli in WWI
http://thecomicrepublic.com/readcomics.html - free downloadable comics from Nigeria! Compare US hero comics to these as a cultural learning experience in the classroom
https://www.comixology.com/free-comics there are some freebies in with the paid comics
https://comicstore.marvel.com/free-comics- some freebies
http://comicbookplus.com - older comics that have entered the public domain - fascinating!
https://digitalcomicmuseum.com// - another for comics in the public domain
- Make a mini comic from one piece of paper! Posted by the Smithsonian!
https://t.co/FdPMeigPgC - Free Marvel comic teaching about the environment
http://www.diamondbookshelf.com/Home/1/1/20/1219 - Diamond Bookshelf Magazine. Great resource for educators and librarians. I have written several articles for them - how to get comics approved for the classroom, integrating historical fiction, and more.
/ - Fred Korematsu - Japanese-American Interment Camps - includes a free graphic novel making connections between 9/11 and these iternment camps