There's no way you honestly believe that. For instance do you think it should be illegal for a daycare to not allow 20 year olds to enroll? Discrimination on age, check. Specious example. The daycare service is not providing a service or doing business with the child, but with the child's parents. Should it be legal for them to refuse to enroll the child of black or gay parents?
Sadly that state of being was thrown out by Lincoln when he unilaterally declared war on some of the States. As he is considered one of your greatest Presidents it seems the vast majority of Americans agree on the federal power grab and now your country is at the present point.
Sadly, you're understanding of history is lacking. Lincoln did not declare war unilaterally. He did not declare war at all, since there was no foreign country involved. Additionally, it was the South that initiated the conflict by firing on a Federal military installation. All of which has fuck all do to with why crackpot Christians should be able to force gay folk to the back of the bus.