What geographic feature is to the left of the 13 colonies

Appalachian Mountains

Explanation:

The mountain range was called the Appalachian Mountains. Britain did not let the colonists go past this mountain range, as they will not protect them from attacks.

This is a part reason why the Revolutionary War happened.

an expansion is one of two basic business cycle phases; the other is contraction. the transition from expansion to contraction is a peak, and the changeover from contraction to expansion is a trough.

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