Hahaha; I don't know! I don't think liberals are the only ones that say it though. The truth, which was made abundantly clear just this past decade, is that rich people only have one nationality to which they are loyal: other rich people. The richest families and biggest corporations in the US are well-integrated with the richest families in Saudi Arabia and so on. We're not the wealthiest, the healthiest, or the smartest nation in the world. In fact, we're pretty low in all categories. We just have the largest navy and air force and most nuclear weapons. We also spend the most per capita, but that just means our economy is based on consumerism, retail, logistics, and marketing.
It seems to me that the wealthiest of the wealthy Americans are giving away their money to charities and research on their deaths. Executives or corporate middle-management guys like me will probably emigrate and chase work as it leaves the country to be based in Europe or the far east.
The US side-stepped an economic landmine (or pressure-detonated IED, for those speaking 21st-Century army language) in 2008 and 2009 with a spending bubble that will not last ten years. We still have not regulated the banks, by the way. The economic catastrophe awaiting us is supposed to be very bad.