What was the importance of World War 1 and World War 2?

Answer 1

In a nutshell, World War I dissolved the empires of Europe and set the stage for some countries becoming democratic, and others following the path of socialism, fascism, and communism. Its treaties and boundaries led to bitterness that allowed Hitler to rise to power and start WWII. WWI also brought an era of prosperity in the United States and then depression that spread to the rest of the world. World War II set the stage for a divided Europe, resulted in vast technological advances in warfare, and brought the Cold War upon the world.