As the chart shows, America's debt is currently $15.1 trillion, while the Eurozone (which includes France, Germany, Greece, Italy, Spain, the U.K., and others) has a combined debt of $12.7 trillion. (All dollar amounts are in U.S. dollars, and the data refers to closing 2011 numbers.)
The Eurozone is larger than the United States, so America's debt per capita also exceeds the Eurozone's. According to the Census Bureau, the U.S. has a population of 313 million, whereas the Eurozone has a population in excess of 331 million.
Republican presidential candidate Mitt Romney frequently warns that the United States should not become like Greece. "We need to rein in government and unleash the extraordinary vitality and creativity of the American people," Romney wrote in a December op-ed. "We must not wait to suffer a crisis like Greece's or Portugal's to right the ship of state."
But with charts like this, that formulation might already be out of date, considering the enormity of America's debt burden....
What's will be the consequence of this debt are (at least to me) obvious .... inflation, cuts in programs, and (for the readership of this blog) a smaller national defense....
The mood of uneasy calm seen across Europe since the Greek bailout in February was shattered as financial markets took fright at evidence of a double-dip recession and growing popular opposition to welfare cuts and tax increases.
Italy and Spain, the eurozone's third and fourth biggest economies, were at the centre of the market turmoil, with investors demanding an increasingly high premium for holding their bonds.
"Spain is right in the centre of a European storm," admitted finance minister Luis de Guindos, who declined to rule out an eventual bailout but insisted it could be avoided.
In Italy, Mario Monti's coalition government is facing growing hostility to reforms of its labour market, while the sheer size of the country's public debt made it an obvious target for nervous traders. The prospect of Greek voters rejecting austerity and the French electorate denying Nicolas Sarkozy a second term as president was also weighing on the markets.
The Greek government said it would hold a general election on 6 May, with opinion polls showing support for the mainstream pro-austerity parties is too weak to allow them to form a government.
"Spain is a big focus right now and even Greece will be coming back into the picture as it looks for another tranche of aid, so this eurozone debt tragedy is not going away, but seems to be getting worse," said Daniel Hwang, senior currency strategist at Forex.com in New York.
Interest rates on 10-year Spanish bonds hit 6% for the first time since January, when Europe's leaders were battling to agree a bailout deal for Greece and secure the future of the eurozone. Shares in Madrid dropped by almost 3% to hit their lowest level since March 2009.
In Italy, share prices slumped by 5% on rumours that the government was preparing to downgrade its growth forecasts, and trading in the shares of several of its banks was suspended after they fell sharply.
Shares were also much lower on Wall Street, where the fallout from Europe exacerbated fears that the US recovery is petering out. Disappointment at last week's unemployment figures had already been weighing heavily on investor confidence.
The markets closed in New York with Wall Street completing a fifth successive day of decline, with the Dow Jones having lost 213 points. In London, the FTSE 100 closed down 128 points, at 5,595.55. Oil prices also fell sharply amid concerns about the prospects for growth on both sides of the Atlantic and in Asia, with the price of a barrel of crude falling by more than $2.
In contrast, safe haven assets such as gold, the US dollar and bonds in the US, Germany and Britain were all in demand. "The market went up on a wave of liquidity-induced euphoria, and as usual overshot. Now the clever boys have decided to get out," said Charles Dumas of Lombard Street Research.
Europe's politicians had hoped that Greece's second bailout, and a battery of emergency measures unleashed by the European Central Bank, including its long-term "repo" operation, which offered cheap money to troubled banks, would draw a line under months of economic chaos. But Erik Britton, of City consultancy Fathom, said: "The LTRO [long term refinancing operation] and all those things, all it's done is bought a bit of time, but it hasn't addressed the structural problems, even slightly, even for Greece."
He predicted that the ECB could be forced to take fresh rescue measures in the next few weeks to prevent strains in Europe's banking sector from turning into a credit crunch, while in the longer term several more countries – including Spain and Italy – would eventually be forced to write off a proportion of their debts before the crisis is over.
The euro came under pressure on the foreign exchange markets as the mood darkened on Tuesday, losing 0.2% against the dollar, to $1.3080, and more than 1% against the yen. David Song, Currency Analyst at DailyFX, said: "The single currency is likely to face additional headwinds over the near term as the region continues to face a risk for a prolonged recession."
Spain's prime minister, Mariano Rajoy, speaking in the country's senate, warned that his government must stick with its austerity plans, saying: "There's no doubt that much of Spain's future is at stake and also economic growth and the creation of jobs over the coming years."
But the central bank governor, Miguel Ángel Fernández Ordóñez, added to the mood of anxiety by warning that unless the economy improves, the country's struggling banks will need a new government bailout. Successive waves of austerity measures have already driven Spanish unemployment to 23%. Some 50% of young people are out of work.
Jane Foley, currency strategist at Rabobank, said: "The Spanish government appears to be losing the battle to restore budgetary credibility while each additional austerity measure serves to feed the recessionary backdrop."
In London, Barclays shares fell by 6% to 206p and were the second-biggest faller in the FTSE100 amid fears about its troubled Spanish operation. In February Barclays borrowed €6bn from the ECB's cheap loans scheme to pour into its Spanish operations.
The fresh bout of turbulence comes as the world's finance ministers and central bank governors prepare to fly to Washington next week for the half-yearly meeting of the International Monetary Fund. Following the measures taken by the ECB, the fund had been hopeful that the talks would be less fraught than those last autumn, when Europe's leaders were told to get to grips with their problems.
Christine Lagarde, the IMF's managing director, will almost certainly use the renewed crisis in the single currency zone to seek support for an increase in the fund's resources. But several countries, including the UK, have signalled that they would be reluctant to contribute significant new funds to the IMF unless they can be convinced eurozone leaders have done everything possible to tackle sovereign debt....