This section is from the book "Constitutional Law In The United States", by Emlin McClain. Also available from Amazon: Constitutional Law in the United States.
Congress has authority to organize territories and provide for local governments therein, analogous in some respects to the governments of the states. Frequently, but not uniformly, territories thus created have been subsequently admitted as states with the same boundaries, but even when so admitted the state government has gone into operation under the constitution adopted at the time of its admission as a new government. It is proper, however, to provide and is often provided by the statute for admission that the laws of the territory shall remain in force until they are superceded by the adoption of state laws under the authority of the constitution of the new state.
 
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