Who had the hardest time finding supplies during the american revolution

British Troops.

Explanation:  Those who had more difficulty finding supplies during the American Revolution, were the troops sent by Great Britain, since this nation was leading the war from there, which caused great problems of logistics, communication, supply problems and therefore poor feeding of the troops, since within the United States they did not have nerve points, which would make it easier for them to stock up and meet the smallest basic needs. While the settlers, despite the fact that during the beginning of the war, they also dodged all kinds of difficulties, they could resist until the end, which meant the victory of the United States War of Independence.

answer; (d) i believe that the correct answer is americans finally ran out of ammunition;

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