History Channel video discuss the motives of Crusaders and their religious leaders, as well as the impact of the Crusades on Europe.

John Bellaimey explores the intertwined histories and cultures of the major religions: Hinduism, Judaism, Buddhism, Christianity and Islam.

By Cogito.

By Cogito.

By Cogito.

John Green explains the early development of Christianity.

John Green teaches a brief history of Islam.

7 things you don't know about the Muslim pilgrimage.

Video by National Geographic 4:27

Video on Gutenberg and the printing press (13:41)

In this History Wonders video, brought to you by the History Channel, learn about the founding of the Aztec Empire in Tenochtitlan. The Aztecs really started to control the city when they defeated their overlords, the Tepanecs.

This installment of "Wonders of Latin America" looks at human sacrifice and the mighty Aztec emperor Ahuitzotl, who supposedly orchestrated a massive sacrifice of 20,000 people.

5 minute History channel video discussing Galileo's discoveries and trials.

History Channel video on the role of Robespierre in the Reign of Terror during the French Revolution.

From the History Channel: "In the wake of the French Revolution, a young Napoleon Bonaparte beings a meteoric rise to power."

History Channel article with photo gallery and related videos.

PBS documentary discusses how the Spanish American War generates debate over America's newfound role as an imperial power.

8 minute video focuses on the details of the assassination attempt and the background of the assassin(s).

News coverage produced by Newsy marking the centennial of the assassination of Archduke Franz Ferdinand.

13 minute overview of the Russian Revolution[s] from 1881 to 1923.

History.com video details the events and outcry surrounding the sinking of the Lusitania

49 minutes. History Channel documentary. The Allies defeat the Germans; Versailles Treaty; economic depression leads to rise of Hitler.

John Greene presents an overview of the end(?) of World War I, and its effects on the world. 14 minutes.

John Green presents this look at how European countries did (or didn't) recover from the devastation of WWI during the 1920s. Length- 14:47.

John Green explains how economic and social conditions contributed to the rise of authoritarian leaders during the 1920s and 1930s.

Brief overview of causes, effects and key events during WWII. Recommend watching with Closed Captioning turned on. 6.5 minutes.

History Channel docudrama. This episode focuses on the beginning of WW2: the Nazi-Soviet Pact, the invasion of Poland, Blitzkrieg, the Battle of Britain. 49 minutes.

49 minutes. This episode focuses on the Pearl Harbor and US entry into the war, as well as the Holocaust. Key turning points are highlighted: the Battle of Stalingrad and the Battle of Midway.

49 minutes. History channel documentary. This episode focuses on D Day and the conclusion of the war, including Hitler's suicide, Germany's surrender, the dropping of atomic bombs on Japan, and the post-war occupation, relations and recovery.

70 minutes. Documentary by History Channel and ABC News. Highlights experiences of civilians during the war using historical footage and interviews with survivors in three segments: the Blitz (England), German controlled territories and Japanese controlled areas.

Excellent overview of the causes and consequences of WW2.

14 minutes. Cartoon overview of causes, combatants and key events during WWII. 

Note: If you choose this video instead of Crash Course, you need to make sure you watch Part 2, as well.

Additional Note: Every Oversimplified video starts with a commercial for the platform used to create the video.

14 minutes. Cartoon overview of key events leading to conclusion of World War II.

Note: Make sure you watch both Part 1 and Part 2 in this series.

Additional Note: Every Oversimplified video appears to start with a commercial for the platform used to create the video.

John Green explains. 12 minutes.

John Green explains the origins of the Cold War and analyzes its impact on the world.

John Green explains. Turn on the captions, it helps!