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The highly organized farmers of the Ohio River Valley were called Mound Builders. They <span>were inhabitants of </span>North America<span> who, during a 5,000-year period, constructed various styles of earthen </span>mounds<span> for religious and ceremonial, burial, and elite residential purposes. </span>
Answer:
The attack on the Pearl Harbor Naval Base by Japan.
Explanation:
After Japan launched their offence on Pearl Harbor, the United States became involved in the war. Before this, we were neutral and didn't want to be involved in the conflict. It was an act of pride by the young men who had enlisted.
<span>Railroads created time zones, the growth of cities and the first truly national market.</span>
