USA HISTORY

Detailed explanation-1: -The Oregon Country was claimed by three different countries in the early 1800s. The Oregon Country was important to Americans because they wanted access to the gold fields in California. The Oregon Trail started in Missouri and ended near the Columbia River.

Detailed explanation-2: -The Oregon Territory stretched from the Pacific coast to the Rocky Mountains, encompassing the area including present-day Oregon, Washington, and most of British Columbia. Originally Spain, Great Britain, Russia, and the United States claimed the territory.

Detailed explanation-3: -Reason for Claim Many Americans wanted to be able to get to the Pacific Ocean. One way to do this would be to control Oregon. In 1819, the United States and Spain signed the Adams-Onís Treaty. With this treaty, Spain gave up its lands in the Oregon Country.