USA HISTORY

Detailed explanation-1: -It was the chronological of the event are the arrangement on the Louisiana Purchase, U.S. acquires California, and Oregon. Therefore, option (a) is correct.

Detailed explanation-2: -The Oregon Trail was a major route that people took when migrating to the western part of the United States. Between 1841 and 1869, hundreds of thousands of people traveled westward on the trail. Many of them traveled in large wagon trains using covered wagons to carry their belongings.

Detailed explanation-3: -Diseases and serious illnesses caused the deaths of nine out of ten pioneers. Such diseases as cholera, small pox, flu, measles, mumps, tuberculosis could spread quickly through an entire wagon camp. Cholera was the main scourge of the trail.

Detailed explanation-4: -Gold rush and mining opportunities (silver in Nevada) The opportunity to work in the cattle industry; to be a “cowboy” Faster travel to the West by railroad; availability of supplies due to the railroad. The opportunity to own land cheaply under the Homestead Act.