Which US president declared the first national Mother's Day in the USA?

Question

In 1998, the former President of the Palestinian Authority, Yasser Arafat, declared what day as a national day of remembrance in Palestine for the Nakba?

Answer 1

Woodrow Wilson
9 May 1914: "Now, Therefore, I, Woodrow Wilson, President of the United States of America, by virtue of the authority vested in me by the said Joint Resolution, do hereby direct the government officials to display the United States flag on all government buildings and do invite the people of the United States to display the flag at their homes or other suitable places on the second Sunday in May as a public expression of our love and reverence for the mothers of our country."