Margaret Pearse defeated at the 1922 general election. She supported those who opposed the Treaty during the Irish Civil War and continued to be a member of Sinn Féin until 1926. In 1926 she left the party conference with Éamon de Valera and became a founder member of Fianna Fáil. She never stood for election again. Her daughter Margaret Mary Pearse also joined Fianna Fáil, and served as a TD from 1933 to 1937 and later served in Seanad Éireann as a Senator from 1938 until her death in 1968. At the launch of "The Irish Press" newspaper Margaret was asked to
William Bulfin Cross", and shortly afterwards he was both proprietor and editor of that paper. The sketches he wrote were published in "The Southern Cross" and also, due to his friendship with Arthur Griffith, in the "United Irishman" and "Sinn Féin". Eventually they reached the "New York Daily News". They were published in book form in 1907 by Gill. In 1902 he wrote "Rambles In Eirinn", a well-regarded account of his travels around Ireland by bicycle on his return to his homeland. He became ill during a visit to the United States fundraising with The O'Rahilly for Arthur Griffith's newspaper "Sinn Fein".