What was an effect of nationalism in Europe during the early 1900s?

Question

What was an effect of nationalism in Europe during the early 1900s?

Countries decided to adopt a common language.

Alliances between groups of nations led to World War I.

Countries formed a union to protect European political interests.

Countries learned to work together for the good of all Europe.

Answer 1

How is this mathematics?

I would got with WWI.

Answer 2

This is not Maths whatsoever.

Answer 3

oops, sorry, I pressed the wrong one, my bad.

Answer 4

The correct answer is "Alliances between groups of nations led to World War I." Nationalism during the early 1900s in Europe led to a competition between different nations to assert their dominance and protect their own interests. This competition resulted in the formation of alliances between groups of nations, where countries sought to align themselves with like-minded states to increase their political and military power. These alliances eventually contributed to the outbreak of World War I in 1914, as conflicts between different alliances escalated and led to a widespread conflict among the major European powers.