Progressive Era was a period of economic, political, and social reform in the United States. The era began in the 1890's, during a nationwide economic depression, and was over by the time the United States entered World War I in 1917. Many of the reforms of the Progressive Era were enacled at the local and state levels. However, the U.S. Congress also adopted some key measures. Industry in the United States had grown swiftly during the 1800's. This fast growth caused such problems as corrupt politics, city slums, and poor working conditions in factories and mines. In the 1890's and early 1900's, many reformers helped bring about laws aimed at relieving these problems. These reformers began to call themselves progressives about 1905. Which sequence of events best describes how the Progressive Era began? O rapid growth in cities + people living in slums + the opening of settlement houses = Progressive Era O rapid industrialization + long hours in factories + low wages and dangerous working conditions in factories = Progressive Era rapid industrialization + workers experience poor living and working conditions + corrupt businessmen and politicians block reforms = Progressive Era rapid growth in cities + corrupt businessmen and politicians block reforms + low wages and dangerous working conditions in factories = Progressive Era

Progressive Era was a period of economic, political, and social reform in the United States. The era began in the 1890's, during a nationwide economic depression, and was over by the time the United States entered World War I in 1917. Many of the reforms of the Progressive Era were enacled at the local and state levels. However, the U.S. Congress also adopted some key measures. Industry in the United States had grown swiftly during the 1800's. This fast growth caused such problems as corrupt politics, city slums, and poor working conditions in factories and mines. In the 1890's and early 1900's, many reformers helped bring about laws aimed at relieving these problems. These reformers began to call themselves progressives about 1905. Which sequence of events best describes how the Progressive Era began? O rapid growth in cities + people living in slums + the opening of settlement houses = Progressive Era O rapid industrialization + long hours in factories + low wages and dangerous working conditions in factories = Progressive Era rapid industrialization + workers experience poor living and working conditions + corrupt businessmen and politicians block reforms = Progressive Era rapid growth in cities + corrupt businessmen and politicians block reforms + low wages and dangerous working conditions in factories = Progressive Era