 Construction of the Indianapolis Motor Speedway, expansion of the auto industry, urban development, and two wars contributed to the state's industrial growth.During the second half of the 20th century, Indiana became a leader in the pharmaceutical industry due to the innovations of companies such as Eli Lilly.Following the end of the last glacial period, about twenty thousand years ago, Indiana's topography was dominated by spruce and pine forests and was home to mastodon, caribou, and saber-toothed cats.