What challenges do experts think the United States will face in the future?

Well i'll give you 10 you can choose which 4 u like best:

1.) Marriage Rights

2.) The Decline of Privacy

3.) Another Housing Crisis

4.) A Massive Regulatory Burden (Affordable Care Act)

5.) Ending the Drug Crisis/War

6.) The Broken Two-Party System

7.) Unfunded Liabilities

8.) The Age of Preemptive War

9.) The Collapsing Economy

10.) Restoring Constitutionalism

Fights between countries (trump)