Answer:
John C. Fremont
Explanation:
John Charles Frémont was an engineer, explorer, botanist and politician of the United States. He was part of the United States Corps of Engineers Surveyors. He was the first candidate for the position of President of the United States of America by the Republican Party in 1856. He lost that same year to James Buchanan. He was a major during the Mexican-American War. During that time he took control of California from the California Republic in 1846.