OpenStax
Open Stax: World War Ii 1941 1945: Origins of War: Europe, Asia and United States
Examines the conditions that fostered the rise of Fascism and Nazism, the events during the lead-up to the outbreak of war, and what Roosevelt did to help affected nations yet still keep the United States neutral.
University of Pennsylvania
University of Pennsylvania: The Abraham Lincoln Brigade of the Spanish Civil War
An interesting look at the Lincoln Brigade and those who served in it fighting in Spain against the fascists in the Spanish Civil War.
Library of Congress
Loc: Today in History: July 17: The Spanish Civil War
The Spanish Civil War was a precursor of the tumult of World War II. Read a brief description of those involved in this civil war and see posters supporting each side.