[george wythe]

My only point that the US government and the US courts pick and choose which marriages are valid all the time, at least in the matter of with foreign marriages.

Why do US courts accept a marriage of two hetero people from Peru, but not a marriage of two gay people from Denmark? Do these treaties explicitaly exclude gay marriage or polygamist marriage?

I don't know the answer, I was wondering if you knew why.

As far as the Full Faith and Credit clause, why is that a Florida concealed carry permit is not accepted in Massachusetts? Who determines which state acts are valid nationwide, and which state acts are valid only inside a state?

[concerned about politics]

Why do US courts accept a marriage of two hetero people from Peru, but not a marriage of two gay people from Denmark?

Because homosexuality is not a gender or race.
It's a dysfunctional sex fetish. It's a chosen deviation that requires medical help, not the demoralizing of society to accommodate it.

[jwalsh07]

As far as the Full Faith and Credit clause, why is that a Florida concealed carry permit is not accepted in Massachusetts? Who determines which state acts are valid nationwide, and which state acts are valid only inside a state?

Because the courts are populated with liberal activists who pick and choose what laws to legislate from the bench.