Okay, here's my strategy:
1. Kill all the Sunnis
2. Kill all the Shi'ites
3. Kill all the Kurds
4. Repeat the process in Syria, Saudi Arabia, Iran, Egypt, et. al.
5. Lease the empty land to the Mexicans sneaking across our borders in "search of a better life", while simultanously dismantling the US welfare system.
Should keep us busy for the next 50 years or so...