The historical development that fundamentally transformed gender roles in the 20th century was the women’s rights movement, particularly around the suffrage and feminist movements. Beginning in the late 19th century and gaining momentum throughout the 20th century, this movement advocated for women's right to vote, work, and participate equally in society. Key milestones included women securing the right to vote in many countries, advancements in educational opportunities, and increased representation in the workforce. The movement raised awareness of gender discrimination and propelled efforts for equality across diverse sectors. This transformation has had lasting impacts on contemporary discussions about gender roles and rights worldwide.