Answer:
D: a revolution in Russia
Explanation:
The Bolshevik Revolution in Russia, which led many to fear that immigrants, particularly from Russia, southern Europe, and eastern Europe, intended to overthrow the United States government; The end of World War I, which caused production needs to decline and unemployment to rise.
Fifteenth Amendment, amendment (1870) to the Constitution of the United States that guaranteed that the right to vote could not be denied based on “race, color, or previous condition of servitude.” The amendment complemented and followed in the wake of the passage of the Thirteenth and Fourteenth Amendments, which abolished slavery and guaranteed citizenship, respectively, to African Americans.
