Answer:
They were the cause of the succesion and then created the cival war which had to be. fought by the north.
Explanation:
Answer: they could use the new naval bases for supplies and had stronger armies, and more land
Explanation:
What I can infer from what Lewis and Clark saw when moving west from the Mississippi river is that the landscape along the river changed drasticallly. The forest receded, replaced first by the high prairie and then the shorter grass of the high plains. The temperatures became colder and as they continued their expedition by the river they realized that there was no water route to the pacific ocean, just more mountains.
False it helped make picking cotton more efficient and reduced the need for slave labor
