Answer:
<h2>B. Cahokia</h2>
Explanation:
Cahokia was a pre-columbian Native American city across the Mississippi River. It existed in 1050-1350. The Cahokia mound is the site where this city was located, this park is in western Illinois. It covers almost 890 hectares and contains 80 mounds. At its peak around 100 CE it covered 16 square kilometres and had about 120 man made mounds of all shapes, sizes and function. It population was slightly more than London.
1. Explore the Missouri River to its source, cross the
Rocky Mountains, and seek a westward-flowing river
to the Pacific Ocean—the fabled Northwest Passage.
2. Report on new animals, plants, minerals, etc. in
the newly-acquired regions.
3. Establish trade with the Native American tribes
they encountered.
4. Assure the Native Americans of the peaceful
intentions of the United States government.
It's really jam-packed in here, isn't it?
I think it was because they had no other choice.