If each state can make its own laws, why do you have a central government?
The states are the ones that are suppose to have the power. The government was only supposed to provide security thru a military, secure our borders (a joke now), etc. Under liberal law, they want to rule every one from Washington. It does not work.
For example, if central government passed a law to ban the death penalty, each state could bypass that by passing a law to allow it.
If the supreme court deemed it constitutional(and they did many years ago), the feds cannot stop the states from doing so.
Or, on a day to day level, does each state have different driving laws? Like speed limits etc.
How can the average person possibly know what is legal in one state and illegal a mile up the road in the next state?
The interstates are taken care of by the individual states and thus set the speed limits as they deem fit. When you enter another state (like another country over there) there are signs telling you what the speed limit is. It present no problem but the answer to you question is that this country was set up with the states holding the power. This what they are trying to change.
Yeah, the autobahn seems kind of stupid to me however, I like to travel at high speeds. Its just when you run upon a slow car,, well. you better be fast is making decisions.