The main point in theory is the main thing
Answer:
As Americans began to move westward, they wanted to take the land on which Native Americans lived. Some Native American tribes resisted violently. By 1790, many Native American tribes in the western areas had banded together. Many of these tribes supported the British in the Revolutionary War, and they feared what would happen as the Americans began to expand westward. The Americans defeated a group of Native American tribes in the Battle of Fallen Timbers in 1794. This led to the Treaty of Greenville in 1795, which required the Native American tribes to give up some of their western lands.
During the 1800s, more battles occurred. Tecumseh tried to organize the Native Americans into a confederation, as he feared what would happen as a result of continued westward expansion by the Americans. The Americans fought the Native Americans in the Battle of Tippecanoe while Tecumseh was away in 1811. The Americans won this battle, preventing any confederation from forming. In 1831–1832, the Sac and Fox tribes were defeated in Black Hawk’s War. These groups also were unsuccessful in stopping the westward expansion of the American people.
As Americans settled west of the Mississippi River after 1850, more conflicts occurred. The Native Americans were relocated to these lands that were west of the Mississippi River with the belief that the United States wouldn’t expand to these lands. When the Americans did move into these areas, battles were fought throughout the West. The Eastern Sioux attacked settlers in Minnesota, and the army defeated them. They were forced to move to the Dakotas. In Colorado, the Sand Creek Massacre occurred. Many Native Americans fighting with Black Kettle were killed in this massacre. In some cases, the Native Americans fought and defeated the United States Army. The Lakota tribe defeated General George Custer at the Battle of Little Bighorn. The Lakota Sioux and other tribes also inflicted a harsh blow when the American army was lured into a trap in what is known as Fetterman’s Massacre. Many American soldiers died here. However, in most cases, the United States Army fought and defeated the Native American tribes.
There were many battles fought between Native American tribes and the American army as the Americans moved westward.
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On April 22, 1915, German forces shock Allied soldiers along the western front by firing more than 150 tons of lethal chlorine gas against two French colonial divisions at Ypres, Belgium. This was the first major gas attack by the Germans, and it devastated the Allied line.
https://www.history.com/this-day-in-history/germans-introduce-poison-gas
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The scientists in the 16th and 17th centuries developed. c universal language of study
