Coolidge was greatly admired during his time in office, and he surprised many by declining to seek another term. Public opinion on Coolidge soured shortly after he left office as the nation plunged into the Great Depression. Many linked the nation's economic collapse to Coolidge's policy decisions, which did nothing to discourage the wild speculation that was going on and rendered so many vulnerable to economic ruin. Though his reputation underwent a renaissance during the Ronald Reagan administration, modern assessments of Coolidge's presidency are divided. That same month, after Daugherty refused to resign, Coolidge fired him. Coolidge also replaced the Director of the Bureau of Investigation, William J. Burns, with J. Edgar Hoover. The investigation by Pomerene and Roberts, combined with the departure of the scandal-tarred Harding appointees, served to disassociate Coolidge from the Harding administration's misdeeds. New World Coming: The 1920s and the Making of Modern America.