Explain the significance of choosing the 49th parallel as the boundary between Canada and the United States.

Great Britain wanted a border that followed the Columbia River to the Pacific  Ocean.

Since 1818, the US and Britain jointly occupied the territory that is now Oregon, Washington, and Idaho and parts of Montana, Wyoming, and British Columbia. Once the boundary was established at the 49th Parallel, the United States officially expanded to the West Coast.

Explanation: Took the quiz

explanation:

a trial judge has broad powers in his courtroom. the judge's decision is usually final for the duration of the trial, and the party's one special type of witness is an expert witness.

  the common sense as a pamphlet written by thomas paine. it promoted the independence of the colonies from british rule. the distribution of this pamphlet was great, it reached people everywhere and it was even read aloud at places people met. it also unite the colonists before the revolutionary war.

answer is d