1840s in the United States
California Trail
The California Trail was an emigrant trail of about 1,600 mi (2,600 km) across the western half of the North American continent from Missouri River towns to what is now the state of California.
Trail of Tears
The Trail of Tears was the forced displacement and ethnic cleansing of about 60,000 Native Americans of the "Five Civilized Tribes", including their black slaves, between 1830 and 1850 by the United States government.