Different methods for the admission of new states have been pursued by Congress in different cases. Sometimes the proposed state has organized itself by the adoption of a constitution and has asked admission under such constitution; at other times conditions have been imposed, on compliance with which by the proposed state admission has been granted; and again, Congress has sometimes first provided for the formation of a constitution under the authority of an enabling act, and then for the admission of the proposed state when the constitution should be adopted by the people as prescribed by the act. It has not always been required that the constitution under which the state is admitted shall have been submitted for approval by the people of the proposed state, but that has been required in most cases and in all the recent cases of admission.