How was the Oregon territory acquired?

Exploration

In the early 19th century, the Oregon Territory was claimed by both the United States and Great Britain. American explorers such as Lewis and Clark and John Jacob Astor helped to raise awareness of the region, and American settlers began to move into the area in the 1830s.

Diplomacy

In 1818, the United States and Great Britain agreed to jointly occupy the Oregon Territory for a period of ten years. This agreement was renewed in 1827. In 1846, the United States and Great Britain reached an agreement to divide the Oregon Territory along the 49th parallel. This agreement, known as the Oregon Treaty, gave the United States control of the present-day states of Washington, Oregon, and Idaho, as well as parts of Montana and Wyoming.

Settlement

In addition to exploration and diplomacy, the settlement of the Oregon Territory played an important role in the acquisition of the region by the United States. American settlers began to move into the Oregon Territory in the 1830s, and by 1850, there were over 12,000 American settlers in the region. The settlement of the Oregon Territory helped to create a sense of American ownership of the region, and made it more difficult for Great Britain to maintain its claim.