sentences:  All of these parties had to communicate and collaborate to address issues of border security and protecting natural resources.As a result, the U.S.Border Patrol and Forest Service successfully enacted the terms of the 2006 memorandum of understanding, creating inter-agency forums, increasing field coordination and joint operations, and constructing fences and other tactical infrastructure.Governing and managing large and growing metropolitan urban areas, covering numerous local governments and various levels of State and National governments, provides many governance challenges and opportunities.