Why did nationalist movements begin in europe and latin america

The cause of nationalist movement in Europe ad Latin America was world war I. World war I caused a lot of economic damage.

Explanation:

The destruction caused by world war I had put every country in great depression. Every country was trembling and trying to stay afloat in bad economy.

Great depression caused political nationalism and people were losing faith in liberal governments. They wanted a strong government which could handle the pressure of the great depression and economic instability.