Shipbuilding. World War 1 was the first major war in which a mass-produced navy was used.
Mound Builder is the general name or the collective name given to the pre-Columbian Native American cultures who constructed earthen structures for religous, burial and/ or ceremonial purposes. The Mound Builder are famous in building flat earthworks, flat mounds and other forms
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when the Americans found out that Germany had contraction camps.
Explanation:
I think this is correct.
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European encounters with Africa had occurred for hundreds of years. It affected the Africans so some were brought into slavery.
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So States were disappearing. And new States joined the slave trade and became wealthy and powerful.