Endangered Species Act
On December 28, 1973, President Richard Nixon signed the Endangered Species Act into law in an effort to protect threatened species from extinction.
Throughout the late 1800s and early 1900s, people around the globe grew increasingly concerned about the plight of animals nearing extinction. As the bison neared extinction and the passenger pigeon disappeared, people began calling for wildlife conservation. Proponents of the conservation movement introduced the larger American public to the idea of extinction.