What current events are causing some states to talk about seceding from the Union again?

Do those current events compare in any way to the events in the 1800s? Explain your answer.

For Number 3 it would likely be because of obama's Re-Election though its not as recent as this year but still. For number 4 in a sense I think they sort of do and dont at the same time. It is still about race but not about slavery, though the south was really jealous because they didn't want to let go of their slaves yet the north seemed to be prospering and their slaves where free. They had a problem with the president later down the road when lincoln was elected as they have a problem with obama being elected when he was first elected in 2008. And the tariffs which are now considered taxes and business taxes are still a problem now. Nobody really likes the thought of having to pay for their business being good or not prospering.