It lasted 19 years, 5 months, 4 weeks and 1 day
The major cause is the Germany was using submarines to sink down the American ships and killed all of the American soldiers, and that is why the U.S join the war and pay back... mark me brainlist please...
Umayyad Caliphate spread east into Persia and west across North Africa Arab Muslims were put in the Capital of Arab Empire during Umayyad Dynasty.