The "Bonus Army" was the name given to a large group of World War I veterans who marched on Washington to demand that their "service certificates" be repaid to them in cash, since the Great Depression had left many without employment.
D would be the correct answer
I think the most important event was when the pilgrims came to the Americas. Although they came there to escape persecution, they were the first to start a colony and life there. Once that colonization started, many other European also wanted to come to the Americas to find more freedom and escape persecution.