The U.S. government is fixated on wars / “regime change”; because, for the last several decades the U.S. has been the reigning world “Empire” (often called a “hegemon”) with the ultimate goal of eliminating or enslaving all competitor nations and establishing one world government that will be able to control and plunder the earth unopposed. Currently leading the list for conquest are Iran, Syria, Ukraine, N. Korea, and, most importantly, China and Russia. Militarily, Russia poses the severest threat to these plans, which is why Russia is being incessantly demonized.
Increasing the “national debt” is the easiest way to both fund these wars and transfer wealth from the U.S. citizenry to the elites. The majority of the U.S. citizenry, apparently, are too uneducated to realize that there will eventually be a reckoning via the the gradual loss of Medicaid, Medicare, Social Security. other “welfare” benefits, corporate pensions via restructuring, and government spending on infrastructure, education, the sciences, etc. This loss is currently ongoing.
As payment for passing legislation that reduces the above corporate and governmental expenditures, our congressional legislators, who are at the bottom of the elite totem pole, are permitted to inside trade on whatever they believe will increase the worth of their portfolios. Thus, many, if not most of them, will have used their inside knowledge to invest in companies who are about to receive large government orders and/or subsidies; and divest from companies that legislators learn are about to experience a decrease in such moneys.
This is just part of the story. If you are interested in the economic aspects, I’d suggest listening to / viewing Michael Hudson’s “TED TALK” on Economics