How did the regional conflict in western europe lead to the involvement of nations worldwide?

great britain was forced defend its colonies in africa and asia.
alliances and treaties affected nations and colonies internationally.
three allied countries united to conquer the capital of turkey.
serbia's overseas colonies were attacked by germany and austria.

Alliances and treaties affected nations and colonies internationally.

The involvement of Alliances & treaties was what made both World War's truly world wars, as each nation was affected and were forced to honor their treaties. This is why in both cases, the nations tried to stop the war before it escalated too much, but both times failed.

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i believe he was the 5th king of uruk. so c