Progressive Era: A period of societal transition in the early 20th century that aimed to address social issues such as poverty, corruption, and women's suffrage.
Civil Rights Movement: A societal transition during the mid-20th century that fought against racial segregation and for equal rights for African Americans.
Counterculture: A subculture that emerged during the 1960s as part of a societal transition challenging traditional norms regarding authority, gender roles, and civil rights.