Suppose several states in the United States have adopted constitutional carry laws, which allow citizens who pass a background check to buy, possess, and carry a firearm without the need for a state or county$-$issued license. Upon their adoption of these laws, states have seen a significant decrease in violent crimes, so it is suggested that the constitutional carry law is adopted at the federal level. What is this law a result of$?$

Group of answer choices

consistent litigation and reliance on the courts

fiscal disparities among the states

states as laboratories of democracy

accommodation of diversity