During its first decade the newly formed Irish Free State was governed by the victors of the civil war. When de Valera achieved power, he took advantage of the Statute of Westminster and political circumstances to build upon inroads to greater sovereignty made by the previous government. The oath was abolished and in 1937 a new constitution was adopted. This completed a process of gradual separation from the British Empire that governments had pursued since independence. However, it was not until 1949 that the state was declared, officially, to be the Republic of Ireland.