Question

How did world war 1 go from a war between two nations to a world war?

Answer 1

Because of the allies , , at first when it was the two Nations , they started asking there allies to help and they started bribing more nations each time

Answer 2

World war I went from a war between Austria-Hungary and Serbia to a world war because of the expanded alliances of both the central power and the allied power, as each nation promised to support each of their alliances members in time of war.

Hope this helps