Describe one event of the late 1900s that contributed to a shift in public opinion on the federal government and evaluate the impact it had on american society

1900s were mainly know for the shift from progressive era to new era.

The National Urban League (NUL) was introduced in 1910. National Urban League is a civil rights organization who mission was to  enable African-Americans to secure economic self-reliance, parity, power and civil rights.Theodore Roosevelt (1901–1909), William Howard Taft (1909–1913) and Woodrow Wilson (1913–1921) were the main progressive U.S. Presidents. The administration by these 3 U. S Presidents saw intense political and social change in the American society. Progressivism began as a social movement and grew into a political movement. The early progressives also rejected Social Darwinism.

The correct answer out of all of them would be A because United States declared war on Spain following the sinking of the Battleship Maine in Havana harbor on February 15, 1898.