At their peak, grizzly bears numbered more than 50,000 in the Lower 48. They roamed from the West Coast to the Great Plains, from northern Alaska to central Mexico. Facing threats from habitat loss, hunting and conflicts with people and livestock, their numbers dwindled to fewer than 1,000 in the lower 48 by the time the Endangered Species Act (ESA) was implemented in 1975. Today, managers say the Greater Yellowstone and Northern Continental Divide populations have recovered and are ready for delisting. Here's a timeline of the management actions, court cases and notable events that have shaped grizzly bear recovery since their ESA listing through today.