Gray Matter Interactive developed Call of Duty: United Offensive. Call of Duty: United Offensive is an expansion pack available for the Call of Duty game.
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Call of Duty was developed in the United States.
I'm assuming your asking for CoD4, WaW, MW2, and Black Ops. CoD4 and Mw2 were developed by Infinity Ward. WaW and Black Ops were developed by Treyarch. They are both under the publishing company Activition.
Largely, it depends on the standing of the parents on whether or not their 9 year old should play Call of Duty or not. It should also be noted that the modern Call of Duty series is rated "M" for Mature 17+. This rating is not posted on the original Call of Duty, Call of Duty 2, Call of Duty: United Offensive, or Call of Duty 3 - in which are rated "T" for Teens.
The company that sponsors the "Call Of Duty" series, is "Activision"
The Original Call of Duty, Call of Duty: Modern Warfare, and Call of Duty: Modern Warfare 2 were made by the company Infinity Ward. However, this company has since fallen apart.Call of Duty: World at War, and the upcoming Call of Duty:Black Ops were/are being produced by the company Treyarch.