What was Germany's main justification for unrestricted submarine warfare in World War I?

30 points please help me!

40 minutes on this question!

Why was the development of an alphabet an important advancement for the phonician civilization? check all that apply

What was the “u-2 incident” and how did it affect u.s./soviet relations in 1960?

The mass extermination of jews as part of the holocaust during world war ii caused the displacement of millions of jewish survivors. a large portion of them immigrated to which location? a. united states b. poland c. north africa d. palestine e. soviet union