Achieving the “American dream” isn’t feeling so dreamy these days.

The day seems distant when average Americans held to the faith that hard work would secure them employment, a lifestyle they could depend on. And that if they passed that work ethic on to their children, along with a good education, then each generation would fare better in life.

Instead we are a nation haunted by an unemployment rate stalled at more than 9 percent, with little hope on the horizon. Family balance sheets have been blown away by the real estate collapse, causing credit problems. Trillions of dollars in equity wiped out. Wages don’t budge. Yet middle-class security — health care, college educations — has skyrocketed.

Meanwhile, Congress engaged in brinksmanship over raising the federal debt limit, which for any rational government would be technical detail. The deal will not raise a dollar of new tax revenue from the rich but means budget cuts that hurt everybody else. Yet each party in Congress argues fervently that it is standing up for middle-class America.

So how come the middle class continues to struggle? To answer that question, first figure out what this nebulous thing called the middle class is. Let’s leave aside the fine sociological distinctions about white collars and blue collars and pink collars, and say this: This middle class is a vast middle tier of those who work to live, and strive to work a little harder to get a little more in life. Middle class people may save, but they don’t accumulate enough wealth to live off. Almost every buck they get, they spend.

That point matters: Spending creates jobs. In our economy, middle class consumers are the real job creators. Depress their income, and you depress employment.

We’ll never get around to holding politicians truly accountable unless this fuzzy middle demographic — a massive one as a potential voting bloc — gets wise about where it came from in the first place, and how it foundered.

The great prosperity of the American middle class in the late 20th century didn’t just magically transpire. The important groundwork was laid by the federal government via investment. Consider what the creation of the federal highway system did for developers and builders who created our suburban communities and all of the businesses that followed. Or the impact of the GI Bill on so many people who returned to the workforce after World War II.

People didn’t just sweat their way to upward mobility in the past. The federal government’s role in the creation of American middle class is undeniable and central. And our middle-class republic didn’t crash because average Americans forgot how to strive, or keep their noses to the grindstone.

I’m not going to pretend to have all of the answers, but I know one of the major causes in our decline has been the growing gap between the rich and the rest of us. That gap is the widest it’s been in a century, and the future isn’t looking promising. Job growth is disproportionately coming from low-wage areas like food prep and retail clerks.

The growing cleavage between the classes can be traced back as far as 1979. That’s when gains in productivity began to outpace worker incomes. That alone helps explain the frustration of many Middle Americans.

Some of us achieved the college degree our parents never earned, and we could afford the finer things they couldn’t. Most working Americans just soldiered on. Wage gains kept flat-lining or falling in comparison to the costs of living. The climb of upward mobility got steeper. Wage shortfalls could be made up with E-Z credit, for a while anyway. The ruins of that way of life are all around us.

Much today is made of the massive federal deficit. I have a way we can solve that: more jobs. More jobs mean more growth, more tax revenue. But America’s job creators — middle class consumers — are tapped out. Business owners can’t hire until they have consumers to sell to. That leaves the job of stimulating demand to the government. Time for government to lay the groundwork for our future by investing in our middle class.

That is, if we really want an America with a middle class.