Answer:
A civilization is a complex human society, usually made up of different cities, with certain characteristics of cultural and technological development.
Explanation:
The German U-boats blocked British Isle and attacked merchant ships affecting the trading business of US with British, but at some stage the U-boats started to attack ships taking the lives of unarmed passengers, as with the Lusitania ship, which 120 American died. The Germans were asked to stop the attacks but they did not and many US ships sank, shedding off US citizens lives. The submarine warfare enraged the US neutrality which then turned against the German and declared war on March 1 in 1917.
The borders got smaller for a lot of countries at the end of the Great War but the reason for Austria Hungry was because they were the ones to start the war and so as a consequence the victors of the war divided up the Austro Hungarian Empire thus reducing borders.
It was a final action leading to the US declaration of war
