The most important geographic feature was the Appalachians
The correct answer is D
The Indian wars refer to the set of conflicts and minor wars between that country and the different indigenous peoples of the current US territory. Also included are wars between European settlers and Native Americans that led to the creation of the United States.
These wars in North America, which extend from colonial times to the Wounded Knee Massacre and the definitive establishment of the US border. UU in 1890, they were generally resolved with the conquest of native peoples and their forced cultural assimilation or their forced location in reserves. The number of Indians was reduced to less than half a million in the 19th century due to infectious diseases, conflicts with Europeans, inter-tribal wars, assimilation, migration to Canada and Mexico, and declining birth rates. The main cause was the infectious diseases transmitted by European explorers and traders. The United States Census Bureau (1894) provided its estimate of deaths due specifically to the war during the 102 years between 1789 and 1891, including 8,500 Indians and 5,000 whites killed in "individual affairs":
The first engine-powered flight was in 1903 by Wilbur and Orville Wright.
