How did ww1 lead to an economic depression?​

World War I's legacy of debt

Explanation: When the war began Entry into the war in 1917 unleashed massive U.S. federal spending which shifted national production from civilian to war goods. Between 1914 and 1918, some 3 million people were added to the military and half a million to the government.

by improved communication.

hi, according to my research the answer to the first question would be false. al tabari was the author of the first medical encyclopedia & he was a persian scholar not arab