They enforce the law and defend the interest of the united states.
No water dry land dry land = no farming no farming = no food
England was prevented from establishing colonies abroad due to chaos in the country whereby the countries were involved in fighting with each other as well as a revolt from the Irish. The resulting instabilities made it hard for England to establish colonies
Administration officials rejected the idea, largely because they feared that the Iraqi leader would go into hiding, as Panamanian strongman Manuel A. Noriega had done during the 1989 U.S. military intervention in Panama, and that U.S. troops would be unable to find him.