This brief, but engaging PowerPoint provides students an overview of the impact westward expansion had on the environment during both the Gilded Age and Progressive Era. Topics covered include: the cattle industry; overhunting; agriculture in the West; mining; the difference between conservation and preservation; and emerging government policies regarding the environment. Images included to engage students in visual understanding. Key vocabulary is underlined to aid in vocabulary comprehension. A short-answer exit ticket is provided on the final slide to assess student understanding.