The United States has always meddled in other people’s affairs. For those readers who think this statement is an exaggeration, I urge them to peruse the chronology of interventions compiled by the Congressional Research Service. This historical predilection for meddling, however, grew enormously in depth and breadth during the Cold War, and to make matters worse, it is now clear that it exploded after the end of the Cold War.
The Bush-Obama perpetual war on terror is now the longest and second most expensive war in US history, exceeded only in cost by WWII, even if one removes the effects of inflation from the comparison.
Read more here: Franklin C. Spinney: Why the War Machine Keeps on Running.