Between Great Britain and the United States, which treaty established the 49th parallel as the border in 1846?

Between Great Britain and the United States, which treaty established the 49th parallel as the border in 1846?

• A. Treaty of Paris
• B. Oregon Treaty
• C. Adams-Onis Treaty
• D. Treaty of Ghent

Answer: (B)

The main idea here is how nations use treaties to settle where their borders are. In the mid-1800s, the United States and Britain both claimed the Oregon Country, and tensions grew as people moved west. To avoid conflict, they reached a settlement in 1846 that set the boundary along the 49th parallel from the Rocky Mountains to the Pacific Ocean. The United States gained land south of that line (what we now know as Oregon and Washington), while Britain kept lands to the north (including Vancouver Island). This agreement finally defined the Pacific Northwest border. Other treaties mentioned were about different places and issues: the Treaty of Paris ended the American Revolution, the Adams-Onis Treaty settled U.S.-Spain boundaries, and the Treaty of Ghent ended the War of 1812. They did not establish the Oregon boundary along the 49th parallel.

The main idea here is how nations use treaties to settle where their borders are. In the mid-1800s, the United States and Britain both claimed the Oregon Country, and tensions grew as people moved west. To avoid conflict, they reached a settlement in 1846 that set the boundary along the 49th parallel from the Rocky Mountains to the Pacific Ocean. The United States gained land south of that line (what we now know as Oregon and Washington), while Britain kept lands to the north (including Vancouver Island). This agreement finally defined the Pacific Northwest border.

Other treaties mentioned were about different places and issues: the Treaty of Paris ended the American Revolution, the Adams-Onis Treaty settled U.S.-Spain boundaries, and the Treaty of Ghent ended the War of 1812. They did not establish the Oregon boundary along the 49th parallel.