According to the chart presented in this thread the problem began BEFORE he was president.
Your ongoing denial is a sign of extreme indoctrination, of faith in falsity.
If there's a grease fire on the stove & you try to put it out with gasoline, then the problem really started before you applied the gasoline, right?
That's what Reaganomics accomplished, and what Repub policy has continued ever since. The problem of concentration of wealth & income at the tippy top has always existed, with the strictures of the New Deal having it largely contained until the technological changes of the 70's tipped the balance. That concentration is enormously deflationary by its very nature.
Reaganomics tipped it even further, and only massive govt spending has maintained the illusion that such is not the case. Reagan's defense spending tripled the debt, countering the deflationary aspects of policy with inflationary ones. The same is true of Bush, who doubled the debt.
Even worse is the fact that Bush policy allowed enormous private debt to be created in the form of the housing bubble. The collapse of that has been and will continue to be extremely deflationary, because it affects the middle class in a profound way.