Question

States , not the congress would retain ultimate authority this is a good idea because

Answer 1

States have different conditions (some are very agriculture-based, so farming laws will affect them a lot, while others are export-based, so tariffs impact them), so certain laws may not be good for them, but would benefit the country as a whole. If congress has all power, then more populated states can overpower tinier ones. States having their own power means that they can react to their different conditions