Add a section to the Territories sub-rule of World called Control :-

A Territory may be controlled by a Country, occupied by a Country, disputed by two or more Countries, or uncontrolled (the default).
The occupying or disputing Countries are listed in the Controller field. These Countries must have a non-zero population presence in the Territory, which is listed in the Population field. This information is broken out as follows:
Controller:Occupied by Country1 OR Disputed by (Country1, Country2, etc…)
Population: (# native population) (presence of Country1, presence of Country2, etc…)

Also remove the New World rule and add its text to the end of the Territories rule, instead. (no need for a separate rule.)