When did the American empire start to decline?

When did the American empire start to decline? By Stephen M. Walt

"But no strategy is so bad that somebody else can't make it worse. And that is precisely what George W. Bush did after 9/11. Under the influence of neoconservatives who had opposed dual containment because they thought it didn't go far enough, Bush adopted a new strategy of "regional transformation." Instead of preserving a regional balance of power, or containing Iraq and Iran simultaneously, the United States was now going to use its military power to topple regimes across the Middle East and turn those countries into pro-American democracies. This was social engineering on a scale never seen before. The American public and the Congress were unenthusiastic, if not suspicious, about this grand enterprise, which forced the Bush administration to wage a massive deception campaign to get them on board for what was supposed to be the first step in this wildly ambitious scheme. The chicanery worked, and the United States launched its unnecessary war on Iraq in March 2003. "

Bill