Part of Everything you need to know about Israel-Palestine ... Many Arabs saw the influx of Jews as a European colonial movement, and the two peoples fought bitterly
a series of complicated factors caused the war, including a brutal assassination that propelled Europe into the greatest conflict the continent had ever known. The murder of Archduke Franz Ferdinand outraged Austria-Hungary. ... Austria-Hungary was furious and, with Germany's support, declared war on Serbia on July 28.
To enforce and implement laws made by the Congress.
Yes it helped Europe from outside threats
