European nationalism during the late 19th century led most importantly to World War One. The Kaiser in Germany sought, through a new heightened sense of nationalism, to expend Germany's territory.
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TanA=a/b
tan64=x/17
x=(17)tan64
x≈34.9
"Both civilizations sprang up <span>in locations with water sources" would be the best option from the list, since water during this time was crucial for the development of civilization. </span>