Ford chevy chrysler hersheys the list goes on and on everything is outsourced
The U.S. Government ? They sure seem to be good at it.
I am from USA , The company which I like is Thinsquare LLC, This company actually helped me in my projects, when I got stuck. You can have a look.
You can easily search suitable outsourcing a company in USA on clutch.co, Extract.com and goodfirms.co. Just filter your search by number of customer reviews and your will have the company list. I would suggest Octal IT Solution as they have decade of experience in outsourcing and 4th most reviewed mobile app development company at clutch.co