2. Although not a formal statement in the US Constitution, why has the idea of
"separation of church and state" become a valued principle?

Explanation:

because if the state ran the church it would tell the church how to run their services and what they can say.  and like wise same with the church if the church ran the state it would hold all the power and would tell the state what can and cannot do, an example would be the middle ages when the church had all the power

president franklin roosevelt supported the tva as part of his first new deal measures approved by congress in 1933. this new agency was designed to control floods, produce electric power, and improve the lives of people living in the tennessee valley. the tva accomplished many of these goals despite problems.