a detachment used for security or reconnaissance
maintain the security of by carrying out a patrol
a line that indicates a boundary
the activity of going around or through an area at regular intervals for security purposes
the boundary of a surface
the executive and legislative and judicial branches of the federal government of the United States
North American republic containing 50 states - 48 conterminous states in North America plus Alaska in northwest North America and the Hawaiian Islands in the Pacific Ocean; achieved independence in 1776
