The Ocean Mail Act of 1891 is passed by the Fifty-first United States Congress, providing subsidies to steamships for the carrying of mails between US and foreign ports.
May 5 – The Music Hall in New York (later known as Carnegie Hall) has its grand opening and first public performance, with Tchaikovsky as guest conductor.
May 20 –Thomas Edison's prototype kinetoscope is first displayed at Edison's Laboratory, for a convention of the National Federation of Women's Clubs.
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