The siege of boston, which began in 1775, ended in 1776 when
a-the continental army left boston.
b-the british allowed supplies to enter boston.
c-the british were forced to leave boston.
d-the olive branch petition was signed.

where is the diagram

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