World War I [Part 1]

5. What was the German military strategy to quickly defeat France by invading through Belgium, which ultimately led to a stalemate on the Western Front?
7. What type of fortified ditches, dug by soldiers for protection, were frequently used on the Western Front during World War I?
9. What term describes the systematic mass murder of the Armenian people by the Ottoman Empire for allegedly supporting the Russians during World War I?
10. What intercepted message, proposing an alliance between Germany and Mexico, was a factor in the United States' decision to enter World War I?
11. What term describes the political and military cooperation between European powers contributing to tensions leading up to World War I?
12. What term refers to the aggressive buildup of military forces and glorification of war, which heightened tensions between European powers before World War I?
13. Who was the Bosnian Serb nationalist who assassinated the heir to the Austro-Hungarian throne, sparking the events that led to World War I?

1. What new weapon was associated with the high number of casualties during World War I?
2. What term describes the intense pride and loyalty to one's nation at the expense of others, which was a significant cause of World War I?
3. What British passenger ship was sunk by a German submarine, leading to many American deaths and increased tensions between the United States and Germany during World War I?
4. Which term describes extending a nation's power and influence through colonization contributed to the tensions/competition leading up to World War I?
6. What type of airship, used by Germany during World War I, was filled with highly flammable hydrogen gas and was often ineffective.
8. Who was the heir to the Austro-Hungarian throne whose assassination in Sarajevo triggered the start of World War I?