Which historic figure is associated with the rise of modern social movements in the 20th century?

Martin Luther King Jr. is prominently associated with the rise of modern social movements in the 20th century, particularly the Civil Rights Movement. His leadership and advocacy for nonviolent protest played a crucial role in challenging racial segregation and discrimination in the United States. King’s ability to articulate the struggles and aspirations of African Americans, combined with his effective use of public speeches, such as the famous "I Have a Dream" speech, galvanized public opinion and inspired widespread activism across the nation.

His efforts not only advanced civil rights but also influenced various other social movements, including those focused on labor rights, anti-war sentiments, and issues related to poverty. As a pivotal figure, King helped to unify different groups under the larger framework of social justice, establishing the foundation for future activism and inspiring generations of leaders and movements advocating for equality and rights for disadvantaged populations. Through organized marches, sit-ins, and boycotts, his approach highlighted the power of grassroots movements and the importance of civic engagement in achieving social change.