"... remember that the States have the right to make certain laws that cover their citizens."

I do know that.... I also know that 'certain' laws make no sense when they limit their citizens in what are coming to be recognized as rights, not 'privileges'. When states use the concept to simply discriminate, it is time to change the system... much like happened with slavery.

In a city where a river or street defines state borders, it does make no sense for a committed couple to have the right to marry on one side of the border and not the other.... or to have easy access to voting... or to have access to health care.

Taxes & inheritance may involve different situations in different states, but items dangerous to health .. not so much. Gun laws are a can of worms because some states have areas where guns are vital for hunting, defense against predators ....etc.

As I have posted several times, state-specific laws which made a reasonable sense in 1800 may NOT be reasonable in the 21st century. Trouble is, some require amending of the Constitution... and that requires 3/4 of the states to ratify them. Kinda of a vicious circle, hmm?