The Ohio river is an example of a tributary because? HURRY PLSSS

Because the Ohio River flowed westward, it became a convenient means of westward movement by pioneers traveling from western Pennsylvania.

Explanation:

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

answer; i believe that the correct answer is,lies(political rhetoric);