It is caused *entirely* by:
1) Bush's tax cut (reducing revenue)
2) Bush's two wars (raising spending)
3) Bush's Great Recession (lowering tax revenue)
4) Recovery from Bush's recession (raising spending)
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An added expense during all this is the interest payments on the massive Bush deficit.
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Remember, President Reagan and Bush the Elder nearly tripled the national debt in the period 1981-1993,
The fallout from Bush the Lesser tripled it again.
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Republicans created this massive debt as a scam to kill Americans.
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That's what they don't want you to know.
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As I noted, the deficit in Bush's final fiscal year was $1.4 trillion. It was going to be $1.7 trillion--Obama managed to lower it by $300 billion. By the time he left office, annual federal deficits has been reduced by roughly $1 trillion.
It will, without doubt, skyrocket under Trump as well.