On the sales tax - California has a statute that says you are obliged to pay tax when you purchase out-of-state. Most of us have no idea, but you are supposed to self-report at the end of each year ......
Well, its right on the state income tax form we file each year, so I would say that most people *choose* to "have no idea" about it. Lol.
In Illinois, I believe the change in tax law concerned how an out of state business registered in the state. Before this year, if a business had a physical presence in the state, it would be required to collect sales tax. Now, merely a legal presence in the state triggers the sales tax collection requirement.