Name the longest river in North America, an important pathway for the westward expansion of the United States throughout the 19th century.

Besides being the longest river in North America, Missouri River is also historically significant. For over 12,000 years, people have relied on the Missouri and its streams as a source of nourishment and transportation. More than ten primary tribes of Native Americans occupied the watershed, most adopting a nomadic lifestyle and depending on vast bison herds that wandered over the Great Plains. In the 19th century, however, the river became one of the key pathways for the westward expansion of the United States.

Asked by Vasilii Kulev · Last updated 4 years ago · 25.4K views · SOURCE