What is the answer to reducing the long-term debt of the United States (now at $6 Trillion dollars)?
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Stop giving the military industrial complex so much 'welfare'.
Return to taxing those who can afford to pay.
Impose tariffs on goods made in slave states like China, Mexico, etc. and put Americans back to work so they can pay taxes.
Make sure all corporations - American, foreign and multinational - who do business in the USA pay their fair share.
Of course, none of the above will be accomplished as long as either rightist party is in control.