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None. Yellow lines on the road was a British idea. Britain introduced the idea to Canada, then the US adopted the idea from the Canadians. Michigan was the first American state to paint the lines on their roadways.
The first highway in the US was the wilderness road.
The "First State " of the US is thought to be Delaware, because it was the first state that ratiied the new US Constitution. Delaware's state motto is "The First State."
Delaware was the first state to ratify the US Constitution on December 7, 1787. This is why it has the state nickname The Constitution State.
The first US mint (as versus a state or private coiner) opened in Philadelphia in 1792.