Julia Roberts' won her first Oscar as Best Actress for for her role in which film?

Julia Roberts earned her first Academy Award for Best Actress for her compelling portrayal of the titular character in the 2000 biographical legal drama, "Erin Brockovich." The film, directed by Steven Soderbergh, dramatizes the true story of an unconventional single mother who, despite lacking formal legal training, played a pivotal role in a massive lawsuit against the Pacific Gas and Electric Company (PG&E). Roberts' performance captured the real Erin Brockovich's tenacious spirit, sharp wit, and unwavering determination to fight for justice for the residents of Hinkley, California, whose groundwater was contaminated by hexavalent chromium.

Her acclaimed role was a significant departure from the romantic comedies that had previously defined much of her career, such as "Pretty Woman" and "Notting Hill." Critics and audiences alike lauded Roberts for her raw energy and charisma, which brought depth and authenticity to the fierce and flawed character. The film itself was a critical and commercial success, grossing over $256 million worldwide and garnering five Academy Award nominations, including Best Picture.

Roberts' win at the 73rd Academy Awards in 2001 was widely celebrated, cementing her status as a versatile and powerful leading lady in Hollywood. Her impactful performance not only earned her the Oscar but also a BAFTA Award, a Golden Globe Award, a Critics' Choice Movie Award, and a Screen Actors Guild Award for Best Actress, making her the first actress to win all five major awards for a single performance. The "Erin Brockovich" case itself was a landmark in environmental justice, resulting in one of the largest settlements in U.S. history for a direct-action lawsuit, and continues to inspire communities to stand up against corporate negligence.