What beliefs and values bring americans together as a nation

How has our understanding of the first sentence of the declaration of independence changed over time?

Why did jefferson oppose the assumption of the debt

Initially, northerners did not want missouri to be included in the union because 1.) maine would not be allowed to enter the union as a free state 2.) missouri wanted to enter the union as a free state 3.) missouri wanted to enter the union as a slave state 4.) maine would not be allowed to enter the union as a slave state