URGENT: How did American settlement in the Oregon Country change starting in the 1840s? A. Fewer settlers came as the California Gold Rush drew most settlers.

B. As the British established control over the region, fewer Americans came.

C. Missionaries and settlers joined the fur traders who went there in earlier years.

D. Disease and conflict with Native Americans made settlement more difficult.

C.

Explanation: The overland migration of Americans to Oregon began in earnest in the early 1840s. In 1840 there were about 150 Americans residing in the Oregon Country. ... The sudden growth of a resident U.S. population, and of settlers rather than fur traders, altered the balance of power in the area that would become U.S. territory.

post the grid otherwise i cant .

also it sounds like a math question not history.