19 April 1896 Nasirid Din Shah is assassinated by an originator of the constitutional movement in Iran and Bahá'ís are blamed.
Abdul-Baha in America
19 April 1912 Abdul-Baha - Talk at Earl Hall Columbia University, New York
19 April 1912 Abdul-Baha - Talk at Bowery Mission 227 Bowery, New York
19-25 April 1915 First Bahá'í International Congress, held in San Francisco.
1916 - Tablet of the Divine Plan Revealed
TABLET TO THE BAHÁ'ÍS OF THE UNITED STATES AND CANADA Revealed on April 19, 1916, in 'Abdu'l-Bahá's room at the house in Bahji; on April 20, in the pilgrims' quarters of the house in Bahji; on April 22, in the garden adjacent to the Shrine of Bahá'u'lláh, and addressed to the Bahá'ís of the United States and Canada. (Abdu'l-Baha, Tablets of the Divine Plan, p. 47)