Lewis & Clark Expedition: 5 Key Achievements & Impact

1. They mapped the Louisiana Territory, adding over 800,000 square miles to the United States.

2. They discovered and described hundreds of new plants and animals, including the grizzly bear, the pronghorn antelope, and the Lewis's woodpecker.

3. They established trade relations with several Native American tribes, including the Sioux, the Shoshone, and the Nez Perce.

4. They explored the Rocky Mountains and the Columbia River, and they were the first Europeans to see the Pacific Ocean from the west coast of North America.

5. They documented their journey in a series of journals and maps, which provided valuable information about the American West and its Native American inhabitants.