May 9, 1914 : the date POTUS W. Wilson proclaimed the 2nd Sunday of May as "Mothers Day"

 Before the Constitutional

Amendment that guaranteed

women the right to vote

federally,

Woodrow Wilson on

May 9, 1914

proclaimed that

Mothers Day

would be observed as

a national day of recognition

______________________

womenshistory - Smithsonian

Institution article about it :

"From Global Peace to 

Greeting Cards"