Why was the discovery of the Mississippi River so important?
Please explain in 3-5 sentences!

The voyage marked the beginning of commercial steam navigation on inland rivers and led to revolutionary economic and cultural change. The river had eventually became such a vital aspect of industry that during the Civil War, control of the waterways was a major strategic objective of the Union Forces.

the apache were not receiving guns from the spanish.(a) is the correct

explanation:

mount st. helens in washington erupts, causing a massive avalanche and killing 57 people on this day in 1980. ash from the volcanic eruption fell as far away as minnesota. seismic activity at mount st. helens, which is 96 miles south of seattle, began on march 16.