How will the U.S. government function properly, considering that there are two political parties opposing each other? ?

Question

Update:

So if “the two party system has failed America”, why do we even have two of them in the first place?

Answer 1

It won't

The main reason you have ONLY two parties opposing eachother is that the first-past-the-post system prevents other parties from gaining relevance

Answer 2

It can't,  the two party system has failed America.