How did the second world war turned global?

-From alliances, and invasion. Germany and Japan were expanding their territory by taking them from others therefore causing war, and those countries have alliances with other countries. Neutral countries turned to allies because they were attacked.To start with it was global; can't be anything else.

Tagging them 'global', perhaps you intended to distinguish it from 'European'. Don't forget the fact that all countries which are 'Combatants' ('Allied' called 'Axis' belligerents while 'Axis' called the 'Allied' belligerents; but both of them were belligerents without nit-picking) in the war have global 'Empires' spread all over habitable continents. A few exceptions like 'Bulgaria' that has no empire, don't alter the picture. With all of their 'Colonies' joining the war on the side of their respective Imperial European countries (do they have any alternative, being suppressed colonies?) the second world war turned global. Even the League (of Nations) never accorded them the status of a 'Country' on any of the Colonies and I don't prefer to use the emotion-filled, wispy word like 'Nation' that is pliable in definition. The war "has to be global".

Well, you may differ from me. If so please come out with your own version that should unambiguously and clearly contradict what I stated.

The next chapter is even more noteworthy. Indonesia & Indo-China were occupied by the rival (axis) Imperial power, Japan that even boasted that it has "delivered" them both from their European Imperialists. In essence Imperialists were the same whether European or Asian. These two Indos remained outside the ambit of their erst-while Imperial yoke. Yet in the case of Indo-China (Laos, Cambodia & Vietnam) another great country that usually boasted of laying its foundation of 'nationhood' as 'Vanquisher of an Empire', stepped into the French shoes or whatever is left of them (the French forces under siege in Dien Bien Phu were starved to the extreme, to eat their own shoes stewed) and the bloody war lasted another three generations. It all made Imperialism fizzle out totally over a period(again globally) and I need'nt mention Cold War.

I must say that the war (WW II) was the start of everything being made 'global' (the egg-heads prefer to call it 'international').
it was a chain of events which led it to become a global war



first it was the guarantees given by england and france to poland ,which caused them to declare war on germany when they attacked poland



hitler had two allies ,italy and japan ------italy attacked north africa ,and japan attacked all over asia



and later japan attacked usa [pearl harbour] -----bringing usa in to battle



hitler attacked the russians by launching an operation called barbarossa



later the countries of the british empire too helped Britain in ww2 [india was under the empire so it had to help Britain in ww2]



russia helped Yugoslavia under marshall tito in ww2 ,to fight hitler



canada fought on the side of the allies



etc etc etc



the chain of security alliances between countries and attacks on each other ,caused the war to become a global war



just my view



good luck