Mark Snow : 60 million hits in 24 hours after release shows evidence for family history . Snow : Hidden for 72 years , it 's now available to all to share family lore or keep a secret . Census shows U.S. during vast change , he says : coming war , receding Depression . The United States instituted its first peacetime draft in September 1940 ; and the ranks of the armed forces mushroomed . Snow : The release was like the first pitch on opening day for historians and economists .
Mark Snow : 60 million hits in 24 hours after release shows evidence for family history . Snow : Hidden for 72 years , it 's now available to all to share family lore or keep a secret . Census shows U.S. during vast change , he says : coming war , receding Depression . Snow : The release was like the first pitch on opening day for historians and economists .