Jurisdiction — In general — Territorial — Exemptions from and restrictions upon — Foreign States — Jurisdictional immunities — Distinction between acts jure imperii and jure gestionis — Contract concluded under forms, methods and rules of private law — Whether jurisdictional immunity to be granted only where contract included clauses entailing exercise of governmental prerogatives on foreign territory — Contract relating to building and renting of dwelling houses for American military personnel in France — The law of France.