The steam boat
The cotton gin and others
Liberty bonds where war bonds. Sold in the United States, it became a symbol of patriotic duty and supported the Allies during World War I. To put it simply, people purchased the bonds from the government and the money went to the war effort.
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Shady, realistic, cartoon
They were quicker; They eliminated Arab middlemen; They allowed Europeans to get goods more cheaply by going straight to the source.