Who gives Congress power to establish post offices?

The U.S constitution.

Explanation:provided Congress the power to establish post offices.

so they can differentiate themselves from others as they saw themselves as the superior race. the star was basically a symbol that meant you are a less of a person than i am because of my race. the star was also degrading for those who had to wear it because they were aware of this and the nazis used the notion to make them feel less like a person.

they died because of a disease during the first spanish colonies.