Hi there
The answer is : September 18, 1947.
I hope that's help !
The settlement of the frontier has defined American History.
I think that the purpose of the U.S. Government is to first of all serve as leadership for the entire U.S. and to make sure that all things are done in order and decency and to set up laws that will keep American society under control. Hope this helps and mark as brainliest if right, please?!