1: Explain how settlers influenced the final border between the United States and Britain in the Pacific Northwest.

2:Explain why most of the settlers recovered from diseases such as measles and smallpox, while the same diseases wiped out significant portions of the Native American community.

3:Marcus Whitman chose a site among the Cayuse, far from the Nez Perce who requested his services. Analyze how Marcus Whitman's selection of the Waiilatpu mission site revealed something of his character and future work.

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Explanation:

The treaty established the 49th parallel from the Rocky Mountains to the Strait of Georgia as the boundary between the United States and British Canada. ... In 1818, a U.S.-British agreement had established the border along the 49th parallel from Lake of the Woods in the east to the Rocky Mountains in the west.

Numerous diseases were brought to The Americas, including smallpox, bubonic plague, chickenpox, cholera, the common cold, diphtheria, influenza, malaria, measles, scarlet fever, sexually transmitted diseases, typhoid, typhus, tuberculosis, and pertussis.

the answer is b i think

(the answer is d)

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