Answer:
Irrigation
Explanation:
Sumerians used irrigation systems to farm and control the Tigris and Euphrates River.
History of opinion polling in the United States is from the straw poll in 1824. There are two types of opinion poling-straw polling and the push polling. The straw poll is a vote within a large group.
Answer:
The Battle of the Philippine Sea
He decided to use nuclear warheads on the Japanese.
Explanation:
Well some people do that to intertain the watchers as well as teach them that way they can help younger people learn history so that they don't forget important events.
In the history of the United States of America, a slave state was a U.S. state in which the practice of slavery was legal, and a free state was one in which slavery was prohibited or being legally phased out. Historically, in the 16th and 17th century slavery was legal throughout British Empire. It existed in all the British colonies of North America. In the Thirteen Colonies, the distinction between slave and free states began during the American Revolution (1775–1783). Slavery became a divisive issue and was the primary cause of the American Civil War. The Thirteenth Amendment to the United States Constitution, ratified in 1865, abolished slavery throughout the United States, and the distinction between free and slave states ended.