Answer:
1.Because the south needed the navigation to keep their economy going. It was a lifeline to them.
2. the US Constitution does not explicitly give the president the power to purchase territory.
3.Sacagawea. While at Fort Mandan, Lewis and Clark met French-Canadian trapper Toussaint Charbonneau and hired him as an interpreter. They allowed his pregnant Shoshone Indian wife, Sacagawea, to join him on the expedition
4.they did however succeed in finding new information about the plants, animals, and Native Americans that were in the region so that American knowledge and culture could become greater.
5. Less likely to get attacked.
Step-by-step explanation: