You won't be educating your customers by saying things like "Country X cameras are junk, but Country Y cameras are awesome."
It's a stereotype.
As for who manufacturers surveillance cameras in the US, very few. The largest is likely Arecont Vision, and they have a terrible reputation for quality, but that says more about their company's culture than the US as a whole.
In general, cameras manufacturer by reputable, well known companies, typically are fairly reliable. The main differences comes in feature sets and manufacturer support.
The least reliable camera manufacturers are the no name shops selling cameras for a fraction of the going rate ($14 for an analog camera, $30 for an IP one, etc.). Those frequently have big quality problems. And most of those are based in China, but that's not because China is inherently bad, but because someone selling cameras at that price level, inherently has challenges in delivering a quality product.