What was the result of the niger river's yearly flooding?

it was disastrous because people drowned.

it was disastrous because crops were destroyed and fish died.

it was minimal because it happened each year at the same time and was expected.

it was minimal because barely anyone lived around the niger river.

president thomas jefferson commissioned the expedition shortly after the louisiana purchase in 1803 to explore and to map the newly acquired territory, to find a practical route across the western half of the continent, and to establish an american presence in this territory before britain and other european powers

d. migration