Describe the territorial changes that took place in the United States in the first half of the 19th century.

The United States bought West Louisiana from France. As a result, the country has almost doubled. The United States forced Spain to hand over Florida to them. In 1846, the Oregon Territory was annexed. Mexico transferred to New Mexico, Northern California, and Texas. In 1867, the United States bought Alaska from Russia. After that, the borders of the United States acquired their current shape.