Well it's tough to say since you don't have options but it was because of fear and making alliances, Germany wanted more land, Germany invading Poland, Germany blocked off trade routes, etc.
Answer:The spread of Christianity and Islam in Europe and Asia contributed to the crusades during the Middle Ages because Muslims want to kill Christians.
Explanation:
The machine guns were introduced in the 1800s so when the investors tested out the machine guns and it got hot they cooled it off with some sort of water filled jacket or else the gun would be shattered hoped it helped
1. The Code- 5,000 Roman laws that were still considered useful for Byzantine Empire
2. The Digest- Quoted + summarized opinions of Rome's greatest legal thinkers about law. 50 volumes.
3. The Institutes- Textbook that told law students how to use the laws.
4. The Novellae- Presented legislation passed after 534