Answer:
WW1 was the greatest conflict world has seen until then. Millions of people died, economy of the countries were devastated and relations between countries were tense.
World War I ended, but it had terrible consequences on the economy of the countries. It was hard to renew the economy of most of the countries, due to harsh condition that continued after the life and the greatest struck came with the Great Depression when millions of people were left without a job.
This led to rise of totalitarian regimes across Europe and world. These regimes promised that they will prosperity and blamed everyone else for the bad things that were happening. They insisted on the spreading of their territory, which eventually led to WW2.
WW2 was even greater conflict than WW1. It was started by Nazi Germany but it involved most of the world. It led to rearrangement of relations between countries and division of world into two ideological parts.
Step-by-step explanation:
First half of the 20th Century is probably the most turbulent period of human history. Two great wars, major economical crisis, totalitarian regimes. All of these things were characteristics of it.