Are the alarm bells finally ringing at the White House and in Congress? They should be. Last week’s pitiful 0.2 percent economic growth for the first quarter of this year means the Obama slow-growth machine trudges onward. It’s the slowest recovery in half a century. The Summer of Recovery that Joe Biden promised in 2009 still hasn’t arrived, six years later.

This is a national crisis, not any less significant than the burning of Baltimore last week. Actually, the two may be tied together. Economist Arthur Laffer shows that racial rioting in big cities is negatively associated with the economic growth rate. In the late 1960s and 1970s, cities became war zones, but the rioting almost entirely disappeared in the high-flying 1980s and 1990s, when incomes were rising, and job growth surged.

Under Obama’s slow-growth economy, urban unrest is bubbling over.

Comparing the growth rate during this recovery with others during the past 50 years, we are $1.6 trillion lower on current gross domestic product than we should be. Even more amazing: With a Reagan-style recovery, we’d have $2.5 trillion more output and income today. On average, every family in America would have $20,000 more annual income.

That’s the crisis that has many Americans feeling so angry. It is, to borrow a phrase from Barack Obama about the Baltimore riots, “a rolling crisis.” He could have being referring to the economy.

One finding in this latest GDP report is especially worrisome. Business “nonresidential fixed investment” – which is spending by companies on plants and equipment and facilities and technology – fell by 3.4 percent. Spending on structures fell by a torrential 23 percent.

This statistic on business spending is a fairly good leading indicator of where the economy is headed. Business investment in this recovery has been slow, and that may be a result of the business bashing that goes on in Washington month after month. The Obama tax increases on capital gains and dividends – which are direct taxes on the returns from business investment – haven’t helped, either.

When we get bad news like this, there’s always some excuse from the White House. The weather. The labor strike at the ports this winter. Ebola. The European crisis. George W. Bush. Maybe next they can blame Herbert Hoover.

Some economists on the left, like Paul Krugman of the New York Times, are blaming fiscal and monetary “austerity” in America and Europe. Austerity? The U.S. government has borrowed $7 trillion in six years. The Federal Reserve’s balance sheet has expanded by $3.5 trillion. This is austerity?

Meanwhile, Mr. Obama is still trying valiantly to put lipstick on this economic pig. His spin forever will be that he saved America from a second Great Depression. Really? White House estimates on job growth show that the economy performed worse than it would have without the trillions of dollars of government borrowing. In other words, we would have been better off not borrowing $830 billion back in 2009.

A new book by James Grant, “The Forgotten Depression,” should be required reading at the White House. It tells the story of the early 1920s, when the economy crashed after President Woodrow Wilson’s disastrous “progressivism.” When the economy tanked, President Warren Harding simply let the recession burn itself out. By doing so, along with the Harding-Calvin Coolidge tax cuts, the result was the Roaring ’20s, one of the most prosperous decades in American history.

Fortunately, there are natural tailwinds that should accelerate growth over the next year or so. Low energy prices are an underappreciated stimulus. The strong dollar is bringing records amount of new investment and construction to the U.S. Profits, especially for the tech sector and companies like Apple and Google, are still very high.

But there’s no getting back that nearly $2 trillion of GDP that is now permanently missing. It’s one reason for inner-city anger. The Obama growth deficit is this president’s enduring legacy. We can now officially declare Obamanomics a grand failed experiment. Let’s hope the history books get this right so we are never, ever, foolish enough to try this again.

 - Stephen Moore is a visiting fellow at the Heritage Foundation and a Fox News contributor.