Why the FµCK was interracial marriage illegal in the USA until 1967, despite the Constitution? I thought USA is a nation based on god?

Not based on God.....

All societies evolve .

Applying today's "moral standards" to the past is equivalent to playing Monday morning quarterback .

It's naive 

Nononono.  Not the dark Jesus.  White Jesus.  That one, not this fake news Jesus all you libertards claim.  The White Man god, not the universal for-everyone god.  Why do liberals keep misunderstanding what god and jesus are and who they are for.

You wanna understand messed-up people?  You have to think like them.  It is hard, and it is painful to do typically (the mind wants to revolt), but a lot of messed-up things people do make a type of sense if you go with their ideas and see where they lead.

Doesn't make them right.  Does make it understandable.  Still messed up as all hell.

Look at today and work backwards......

And order was established. Where the world was going to be white based always. 

They can rape at will of others. And marry their choice of dependent virgins. The tradition of older men was to take their young lad to a whorehouse. A practice I seen overseas by these older men in the US MILITARY.

When women are given a choice and not dependent on them for protections or provisions there WHOLE game of love falls apart. It's why rape is prevalent among those with & without money and/or looks.👁️

It's why feminism and black men are a serious threat to their SYSTEM.

America was a better place then too.

God wanted people to stay where he put them.

No, the USA  Constitution was not based on God, and religion has nothing to do with it either.