Progressive Era: A period in American history (late 19th to early 20th century) marked by significant social reforms addressing issues such as workers' rights, women's suffrage, and child labor.
Civil Rights Movement: A movement that fought for racial equality and end to segregation primarily during the mid-20th century.
Great Society: An ambitious set of social programs introduced by President Lyndon B. Johnson aimed at reducing poverty and promoting equality during the 1960s.