A recent example of the Subsidiary Principle is $\_\_\_\_\_$

Question $13$ options:

the Trump Administration's announcement of plans to build a Border Wall along the U$.$S$.-$Mexican border

the Trump Administration's policy to allow corporations to mine and drill on federal lands

the Trump Administration's decision to let individual states decide how to confront the Covid$-19$ pandemic, gather supplies, and create remedies

the Trump Administration's decision to challenge election laws in several states