Federalism’s interpretation has evolved to balance the power between federal and state governments, with recent jurisprudence favoring a cooperative approach over strict separation. This includes upholding federal statutes when they address issues with broad economic effects that transcend state borders, recognizing the intertwined nature of local and national interests.
For example: The federal government may regulate pollution standards for vehicles, despite transportation being considered a local concern, because pollution does not adhere to state boundaries and thus has nationwide implications.