Which of the following was NOT a reason for the United States entrance into World War I? continued German U-boat activity

German blockade of American port cities
As reflected in the map below, the Great Migration of WWI refers to .

African Americans moving north for industrial jobs

African Americans moving south for agricultural jobs

African Americans moving west to avoid the Dust Bowl

African American soldiers volunteering for duty in the war

Germany’s invasion of Belgium

the revelation of the Zimmerman Note (telegram)