Who was the American General who invaded CA from the American Southwest

Answer 1

From Wikipedia:

In the 1840s, Frémont led five expeditions into the Western United States. While on the third expedition, he and his men committed a number of massacres against Native Americans in California. During the Mexican–American War, Frémont, a major in the U.S. Army, took control of California from the California Republic in 1846.