Over the course of five generations, the Bush and Walker clans have amassed fortunes and political power beyond belief. The family is worth a reported $400 million and has seated two members in the Oval Office.

With the death of the former first lady Barbara Bush at age 92, we're looking back at how his family came to earn such influence.

This retrospective includes insights from Jacob Weisberg's exhaustive biography, "The Bush Tragedy" and more, as well as vintage photos.

Here's how the Bush family became an American dynasty: