Modern dance emerged in the early 20th century as a rebellion against classical ballet's rigidity. Pioneers like Isadora Duncan and Martha Graham sought to create a more expressive, natural form of dance connected to human emotions and experiences. This new style was influenced by social and cultural changes, including women's suffrage and World War I. It challenged traditional gender roles, with women taking prominent roles as choreographers and soloists, and incorporated elements from non-Western dance traditions.