What government department protects americas natural resources

Department of the Interior

Explanation:

This department conserves and manages the natural resources and cultural heritage for the benefit and enjoyment of the people

the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).