The latest snapshot of the U.S. working class shows that unions are in trouble, their ranks thinning amid a backlash against organized labor and a still sputtering economy.

But California and a few nearby states in the Southwest are showing a vastly different picture — labor's ranks are on an upswing. The Golden State's union organizers signed up more than 100,000 new members last year, while the nation as a whole shed 400,000, according to data released Wednesday.

The reason: Latino workers.

After working hard to get here, many Latino immigrants demand respect in the workplace and are more willing to join unions in a tough economic environment, organizers say.