Why did 55 delegates from 12 of the 13 states gather in philadelphia on may 25, 1787?

This map is depicting the 16th century route of what explorer

1. america's first national road morse 2. joined lake erie with the hudson river cooper 3. steam-driven locomotive erie canal 4. allowed businesspeople to keep in touch with trends cumberland 5. telegraph code fulton 6. clermont telegraph

Why did the dakota sioux start an uprising in 1862? a.the government had not followed through with promises of . b.the government had given to an enemy american indian group. c.the sioux were not allowed to sell hunted animals to the us government. d.the sioux had made an agreement with neighboring tribes to attack.