What was the most important element of african trade with europe?

During world war if an artist published an editorial cartoon criticizing the american entry into the war that artists was guilty of

What battle in the civil war was known as the bloodiest war ?

Which statement about submarine use in world war i is true? the allies never found a way to counter german submarine warfare. germany’s use of submarines affected the united states’ decision to enter the war. only the germans used submarines in world war i.