What contemporary issues create conflict between states, and how might the current administration address those issues through national policy?

One such example of an issue that creates conflict between states would be the Affordable Care Act, since this treats most states the same when it comes to penalties. The way in which the current administration addresses this issue is to impose fines for those who choose not to have health insurance.

Explanation:

the effect of the ming leaders banning ships with more than two masts was that there was no further construction of ships masts, because there was a surplus. ming emperors disallowed foreign exploration