Today’s corporate America is dominated by service companies, tech firms, and huge retailers which have thousands of locations and hundreds of thousands of workers. At the end of the decade following WWII, corporate America looked very different from it does now.  Fifty five  years ago, most of the largest corporations in the US built cars, supplied car parts, or provided fuel for America’s vehicles.

What follows is 24/7 Wall St.’s review of how American business has changed, why, and what it looks like today.  The employment figures were compiled using the Fortune 500 database from 1955 and 2010.

Among the ten largest employers in 1955 were GM, Chrysler, US Steel (NYSE: X), Standard Oil of New Jersey, Amoco, Goodyear (NYSE: GT), and Firestone. None could have existed or been nearly as large as they were without the insatiable appetite for American-made cars.  What caused appetites and businesses to change will continue to be a matter of debate between business historians. Did the Japanese make better products? Did spikes in oil prices in the 1970s, 1980s, and two years ago knock the life out of the car business? Or, did the UAW and other large unions bleed the companies through high wages, rich pensions, and health care funds?

Today, four of the ten largest companies by total employees are Walmart (NYSE: WMT), Target (NYSE: TGT), Sears (NASDAQ: SHLD), and Kroger (NYSE: KR). Americans are drawn in huge numbers to retailers with low prices. The industry is dominated by companies which can source cheap goods, run them though efficient supply chains, and market them at low prices. Two of companies on the list from this year are IBM (NYSE: IBM) and Hewlett Packard (NYSE: HPQ). They are the tip of an iceberg comprised of dozens of large tech companies with high margins, rapidly growing sales, and well-paid work forces. This group includes Dell (NASDAQ: DELL), Google (NASDAQ: GOOG), Cisco (NASDAQ: CSCO, and Oracle (NASDAQ: ORCL). With almost no exceptions, these companies did not exist five decades ago.

The decades-long movement away from a United States dominated by smoke stacks to one dominated by computers and malls has also caused a shift in the geographic placement of the country’s better-paid workers. In the 1920s, they migrated to the North – places like Pennsylvania, Ohio, and Michigan – where blue-collar jobs were abundant. Eight decades later their descendants are out of work in numbers that total well into the millions.

Many workers could not be retrained to move from the old economy to the new, and those who could not afford to move from areas with poor employment prospects to those with better ones saw their standards of living decline.

As new industries emerge to replace those which are dominant today, these issues are likely to remain.

The Biggest Employers in 1955

1. General Motors
Employees in 1955: 576,667
Employees today: 204,000

The No.1 car company in the US used to be the No.1 car company in the world. In 1955, GM had more than 50% of the American vehicle market and, between direct employees and those at suppliers, it was responsible for more than 3 million US jobs. GM has emerged from bankruptcy, but has fewer than half as many people, and its US market share is only 20%.

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2. U.S. Steel
Employees in 1955: 268,142
Employees today: 43,000

US Steel was the largest company in its industry worldwide and was among the Fortune 50 in 1955. A large portion of the steel manufacturing business has moved offshore, first to Japan and then China.