List the events leading to US acquisition of Texas and Oregon?

- 1821: Mexico gains independence from Spain, and Texas becomes part of Mexico.

- 1823: The first American settlers arrive in Texas.

- 1835: The Texas Revolution begins, and the Texans win independence from Mexico.

- 1836: The Republic of Texas is founded.

- 1845: The United States annexes Texas, leading to the Mexican-American War.

Oregon:

- 1792: The United States and Great Britain sign the Nootka Convention, which sets the stage for joint occupation of the Oregon Country.

- 1803: The United States purchases the Louisiana Territory from France, which includes the Oregon Country.

- 1811: John Jacob Astor establishes Fort Astoria at the mouth of the Columbia River.

- 1812: The War of 1812 begins between the United States and Great Britain.

- 1818: The United States and Great Britain sign the Rush-Bagot Treaty, which limits naval forces on the Great Lakes and establishes a joint occupation of the Oregon Country.

- 1846: The United States and Great Britain sign the Oregon Treaty, which establishes the current boundary between the United States and Canada.