Toward the end of the 19th century, in response to increased immigration and the broad effort of rebuilding after the Civil War, the country was developing a renewed sense of national identity and history. The government began to enact legislation for the preservation of sites and objects deemed significant to the nation’s history. In 1872, an Act of Congress established the first National Park, Yellowstone. In 1906, the Antiquities Act enabled the President to declare landmarks or objects as a national monument. Then in 1935, during the Great Depression, Congress passed the Historic Sites Act, which outlined programs for research and inventory of historic sites.