The number 4 is because it showed that Congress could apply the Commerce Clause more expansively to national issues if they involved commerce across state lines. That development turned the Commerce Clause into a powerful legislative tool for addressing national problems
Appointing a new justice to the supreme court.
I think D. contains few Sandy beaches but don't take my word.on it
Labor was a problem in the southern colonies because slavery was free labor so the south became dependent on slavery to be successful.
What they have in common is that both actions require consent of the senate. The senate has to vote with a majority for those things to come into effect Hope this helps!