How did the 1842 expedition of John C. Frémont contribute to westward migration? A. He drove Indians off their land.

B. He explored important trade routes.

C. He described the ease of travel to California.

D. He publicized the beauty of the West.

In 1842, Frémont and two dozen soldiers mapped the eastern half of the Oregon Trail. Frémont returned to California in 1845 and convinced American settlers there to revolt against Mexican authorities, which ultimately led to the Bear Flag Revolt of 1846 and the short-lived The California Republic.

i believe the answer would be 1.