Éamon de Valera new line. However, a vote to accept the Free State Constitution (contingent on the abolition of the Oath of Allegiance) narrowly failed. Soon afterward, de Valera resigned from Sinn Féin and seriously considered leaving politics. However, one of his colleagues, Seán Lemass, convinced de Valera to found a new republican party. In March 1926, with Lemass, Constance Markievicz and others, de Valera formed a new party, Fianna Fáil ("The Warriors of Destiny"), a party that was to dominate 20th-century Irish politics. While Sinn Féin still held to an abstentionist line, Fianna Fáil was dedicated to republicanising the Free State from
Éamon de Valera In April 1938, de Valera and British Prime Minister Neville Chamberlain signed the Anglo-Irish Trade Agreement, lifting all duties imposed during the previous five years and ending British use of the Treaty Ports it had retained in accordance with the Anglo-Irish Treaty. The return of the ports was of particular significance, since it ensured Irish neutrality during the coming Second World War. By September 1939, a general European war was imminent. On 2 September, de Valera advised Dáil Éireann that neutrality was the best policy for the country. This policy had overwhelming political and popular support, though some advocated Irish