The Progressive Era in California, spanning from the 1890s to 1920s, was a time of rapid change and reform. As the state's population boomed, activists and politicians tackled issues like corruption, workers' rights, and environmental conservation. Key figures like Governor Hiram Johnson and naturalist John Muir led efforts to implement direct democracy, protect wilderness areas, and improve social conditions. These reforms shaped California's political landscape and set the stage for its reputation as a progressive state.