Chronicling the explosion of subprime mortgages is a bit like reading Murder on the Orient Express. As in the novel, in which everyone is revealed to have had a hand in the murder, America’s subprime story implicates almost every power centre – including the Bush administration, the Federal Reserve and the Democratic party.

Take Roland Arnall, founder and chief executive of Ameriquest Mortgage Co, the California-based company that made more than $80bn in subprime mortgages between 2005 and 2007 and whose company described itself as a “sponsor of the American dream”. meriquest was repeatedly held up by regulators and courts for abusive lending practices, most recently in 2006 when it agreed to pay a $325m fine after it was shown it had misled borrowers, falsified documents and pressured appraisers to inflate home values.

The company, which has since closed, gave $263,000 to George W. Bush in campaign contributions. Mr Arnall, who died last year, went on to become Mr Bush’s ambassador to the Netherlands. To keep things even-handed, his company donated $1.57m to the Democratic party.