Copyright expired because the work was published without a copyright notice and/or without the necessary copyright registration.
Published without a copyright notice in the 1930's, uploaded to public archive in 2014. No legal copyright.
Other information
English: This is a photo taken of a public event in the 1930's and published before 1940. Uploaded to the internet via a public archive. No proper copyrights were ever created. Also qualifies as a historic phot both because the event has not occurred for over 70 years and all participants in the photo are deceased.
Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.