Question

mention 3 causes for world war 1 and 2

Answer 1

Mutual Defense Alliances

Imperialism

Nationalism

Answer 2

World War I occurred between July 1914 and November 11, 1918. By the end of the war, over 17 million people had been killed, including over 100,000 American troops. While the causes of the war are infinitely more complicated than a simple timeline of events, and are still debated and discussed to this day, the list below provides an overview of the most frequently-cited events that led to war.

Mutual Defense Alliances

Over time, countries throughout Europe made mutual defense agreements that would pull them into battle. These treaties meant that if one country was attacked, allied countries were bound to defend them. Before World War 1, the following alliances existed:

Russia and Serbia

Germany and Austria-Hungary

France and Russia

Britain and France and Belgium

Japan and Britain

Austria-Hungary declared war on Serbia, Russia got involved to defend Serbia. Germany seeing Russia mobilizing, declared war on Russia. France was then drawn in against Germany and Austria-Hungary. Germany attacked France through Belgium pulling Britain into war. Then Japan entered the war. Later, Italy and the United States would enter on the side of the allies.