The 20th and 21st centuries brought changes in American demographics, and with change came reaction, and reaction causes new responses. What were these changes, reactions and responses? Consider the impact of WWII, the impact of the Cold War, The Post War Period of economic prosperity and modern liberalism (including the civil rights struggles by African Americans for racial equality and women for gender equality), and the impact of conservative politics and economics after 1972 in shaping Americans’ current view on immigration, race, gender and class.