Question

What was the most important aspect of the 20th century history

Answer 1

Here are a few: "The war to end all wars": World War I (1914–1918)

The Russian Revolution and Communism.

Economic depression.

The rise of dictatorship.

The war in Europe.

The war in the Pacific.

The Holocaust.

The Nuclear Age begins.

Step-by-step explanation:

Answer 2

Here are a few: "The war to end all wars": World War I (1914–1918)
The Russian Revolution and Communism.
Economic depression.
The rise of dictatorship.
The war in Europe.
The war in the Pacific.
The Holocaust.
The Nuclear Age begins.