I would say it started with the Johnson administration.
More recently, the lack of fiscal responsibility under the Clinton/Bush administration and both the Republican and Democratic congresses. There seems to be no one willing to put on the brakes.
Also, as much as I support the concept of less regulation where industry and finance are concerend, virtually NO regulation is another story. Particularly if you remove the downside for failure like we have with all of these bail outs that leads to the question "Why self regulate?" This started with the almost total hands off approach of the FTC under Clinton where mergers were concerend and the almost total lack of oversight of the financial markets then and since.
The ROI on Iraq is obviously an Issue, as is China as our bestest friend and trading non-partner. The less than equitable implementation of globalization for America as well, of course.
Ultimately though, the American people lack the interest, drive and sophistication to manage our political process, by and large. When that began, I don't know. Probably 1788. But we need the opposite now more than ever.
Charon