Answer:in the early twentieth century, President Theodore Roosevelt was a dynamic force in a relatively new movement known as conservationism. During his presidency, Roosevelt made conservation a major part of his administration. As the new century began, the frontier was disappearing. Once common animals were now threatened. Many Americans, including Roosevelt, saw a need to preserve the nation's natural resources. He wanted to protect animals and land from businesses that he saw as a threat. Roosevelt said, "the rights of the public to the natural resources outweigh private rights, and must be given its first consideration."