Carpatho-Ukraine declares itself an independent republic, but is annexed by Hungary the next day.

Carpatho-Ukraine or Carpathian Ukraine was an autonomous region, within the Second Czechoslovak Republic, created in December 1938 and renamed from Subcarpathian Rus', whose full administrative and political autonomy had been confirmed by constitutional law of 22 November 1938.

March 15 is the 74th day of the year in the Gregorian calendar; 291 days remain until the end of the year.