Why is the battle of gettysburg considered a turning point in the war

The Battle of Gettysburg is considered important because it led to the following consequences:

The South abandoned the idea of invading the North.

The South gave up its quest for help from Europe.

The Union victory helped the abolitionist movement gain greater support in the North.

the answer to your question is a. the salt plains

in 1811, he led an expedition, known as the george c. sibley expedition, to improve relations with the pawnee and kansa tribes, and also to locate the rumored jefferson's salt mountain