How did World War I spread worldwide?

I'll try to keep it as simple as possible, and I won't mention all of the nations that took part. First of all, it really began in the Balkans between Austria-Hungary and Serbia. read more

Used as a diversion, or to split attention to more fronts, or to divide troops, attacking the colonial holdings of the opposing empire was how the war spread from Europe and across the world. Note: Australian, South African, Canadian, African, New Zealand and other troops came to fight in Europe to support the Allies. read more

Empires on decline feel they need to reassert themselves to recover their power. Inevitably this leads to military confrontation between combatants sphere of influence (world war). read more

World War I became a global conflict for several reasons. One reason was that many countries around the war were involved in some way with the war. The alliance system helped spread the war quickly. The two main alliances during the war were the Allied Powers and the Central Powers. read more