Are Americans smart or stupid?

Some are smart and some are stupid. I'm sure that's true of every nationality.

Pretty sure brilliance depends on the person

The smart ones usually have very little to say

both

every nation under the sun has both smart and stupid citizens

I've met smart ones. And I've met incredibly stupid ones. Like everywhere. Like others have said, you can't shut the stupid ones up so they tend to give an impression of dominance, just because they're noisy.

We are Both

A large number voted for Trump and still continue to give him the money... Enough said!

Some are smart, some are stupid just like everywhere else in the world

Depends on the person and how they got raised. Some are smart and some are in need for their heads to be screwed with information to be guided about what to do, because they are used to pleasing people.

There are a lot of Americans who are intelligent, educated and thoughtful. They tend to get drowned out by the mouthbreathers, though.

Most are convenience drones, willfully ignorant to the fact that freedom isn't free.

They're a bit below average and declining in IQ at present. Eighth graders can't do civics at all. So in some areas there is total absence of intelligence.
I bet they're number one in shooting accuracy.