The Irish Civil War (June 1922 – May 1923) was the consequence of the ratification of the Anglo-Irish Treaty and the creation of the Irish Free State. Anti-treaty forces, led by Éamon de Valera, objected to the fact that acceptance of the treaty ''abolished'' the Irish Republic of 1919 to which they had sworn loyalty, arguing in the face of public support for the settlement that the "people have no right to do wrong". They objected most to the fact that the state would remain part of the British Empire and that members of the Free State Parliament would have to swear what the Anti-treaty side saw as an oath of fidelity to the British King. Pro-treaty forces, led by Michael Collins, argued that the treaty gave "not the ultimate freedom that all nations aspire to and develop, but the freedom to achieve it".