Why did European nations form alliances in the early 1900s?

PLS MARK BRAINLIEST

European nations increasingly formed alliances in the early 1900s was to be stronger against their enemies on the continent and avoid the beginning of the war. This plan did not work because the first World War took place from 1914 to 1918 between the countries of these two great alliances.

do you want to each other with answers? ?