This is interesting. Don Pepino claims to be America's first fully prepared pizza sauce (New Jersey): http://www.donpepino.com/don-pepino-pizza-sauce.html
So does Pastorelli's (Illinois): http://www.pastorelli.com/wdk_pas/wcm/content/products/retail_products_.jsp
Before the Internet, it was easy to make this mistake.
Most of the brands mentioned here are regional brands. It seems every small company that makes or distributes canned tomato products has a pizza sauce. In this area, I have tried all the brands mentioned here (including the Sclafani brand, also made by Don Pepino's manufacturer), but also Palmieri (New Haven, CT), Casa Visco (Schenectady, NY), DelGrosso (Tipton, PA), Napoli Foods (Waterbury, CT), L. E. Roselli's (Medford, NJ), Cento (Thorofare, NJ), Furmano's (Northumberland, PA), and a few more I forgot the names of. There is a certain sameness to these brands, but they are of higher quality than the national brands.
Having said that, I now use doctored-up Ragu Pizza Sauce, Homemade Style. That is because I try to emulate Shakey's Pizza sauce, which has a kick. The Ragu sauce is cheap when on deal, about $1.29.