which principle was established by Virginia House of Burgesses, the Mayflower Compact, and the Fundamental Order of Connecticut?

The principle of the rule of law

Explanation:

Not only self-rule, but representative government had taken root on American soil. The English Magna Carta, written more than 400 years before the Mayflower Compact, established the principle of the rule of law.

slavery, abortion, donald trump, gay marriage, racial rights, immigration  

explanation:

anything that has been broth up to the supreme court is something of grate political divide   so just look as court cases

its main object was the establishment of "settlement houses" in poor urban areas, in which volunteer middle-class "settlement workers" would live, hoping to share knowledge and culture with, and alleviate the poverty of, their low-income neighbors.