It should be are. The United States is plural, therefore you have to use a plural form of the verb.
ET aliens should live with us.
He has been telling us when you should start.
Yes. You should.
No,you should not be scared of ghosts they are here to guide us and help us.
It is the latter- To
We should care because then they will attack us and hump us
No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No!
In the us
The US should not ban hand guns. A tool is a tool. The user is the problem.
The us flag should be folded in a triangle and stored in a glass box!
He should very nice
No, this violates the first amendment of US Constitution, we should have the right of freedom of expressions.