The US has about 300 million people (well, more, but math is easier if you round it). At $1000 per month, that's a total cost of $300 billion / month, or $3.6 trillion dollars a year.
The US government spent $3.5 trillion in FY2014, according to Wikipedia.
That's assuming there isn't a loss of value in being forced to liquidate $6T in holdings, which there certainly would be. For every seller there has to be a buyer and most eligible buyers would be having their assets seized by the government.
