Mexico declared its independence from Spain in September 1821. Spain later tried to reconquer Mexico, but it failed.
D we the people because that shows specific powers which is the people
The settlers were extemporaneous for the rugged frontier life in a wilderness
They have different histories and orgins, It is also due to the demand and supply of the countries resources.
Johnson's behavior strengthened the unity between moderate and Radical Republicans, and prompted many Democrats to support them as well.