After lewis and clark expedition thomas jefferson sent richard sparks with a group to explore the in 1806. another expedition into the louisiana territory in 1806 went to find the headwaters of the red and the arkansas rivers. this expedition was led by the existence of salt flats in oklahoma was first reported by during his trek down the arkansas river

After Lewis and Clark expedition Thomas Jefferson sent Richard sparks with a group to explore the South-western United States in 1806. Another expedition into the Louisiana territory in 1806 went to find the headwaters of the red and the Arkansas rivers. This expedition was led by trained scientists.  The existence of salt flats in Oklahoma was first reported by George C. Sibley's  during his trek down the Arkansas river.

Explanation:

The Red River Expedition (1806) was the very first regular army scientific voyage to explore the South West of the United States, also recognized as the Freeman-Costis Mission, the Freeman Red River Voyage and Sparks Voyage, formally known as the Red River Mission in 1806.

This was the very first discovery of trans-Mississippi undertaken by professional scientists. In the fall of 1805, For exploration that Jefferson dubbed the "Great Excursion" Parliament allocated five thousand dollars. For the overall industry structure, the army was chosen.

In 1811 the voyage of George C. Sibley to only the Salt Plains was driven by the Osage Indian Sans Orielle from Fort Osage, Missouri. The very first white man to go to the lowlands, that he and his supporters would then name Grand Saline, is said to have been Sibley and his supporters.

it was a act of seld fesnse more over it was a peace treaty between the fogein contunries.

answer; (a) he was a u.s senator for 38 years;