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what
a system where countries are allied together and if one nation declares war on another , any nations allied to that nation must declare war too. During ww1 there were 2 major alliancces in Europe. The entente and the central powers
when
ww1
where
The entente - France Britain, and Russia
why
one of the main causes of ww1
when Austria-Hungary declared war on Serbia the rest of the central powers had to declare war on the Central powers because they where allied with Serbia