Thousands joined May Day rallies in cities from Tampa, Fla., to Bozeman, Mont., with participants braving the cold and snow to deliver their message in some places.
In Salem, Ore., Gov. John Kitzhaber was cheered by about 2,000 people on the Capitol steps as he signed a bill to allow people living in Oregon without proof of legal status to obtain drivers licenses.
More than 1,000 people assembled on the Montpelier, Vt., Statehouse lawn. In New York, paper rats on sticks bobbed along Sixth Avenue as about 200 protesters set off from Bryant Park, chanting: "What do we want? Justice! When do we want it? Now!" The rats were intended to symbolize abused migrant workers.
Many rallies featured speakers with a personal stake in the debate. In Concord, N.H., Kristela Hernandez, 21, said she feared separating from her U.S.-born children if her work visa expires.
"I came here for better opportunities for me and now my children," Hernandez told about 100 people outside the Statehouse. "I'm here to work and to get an education."
Naykary Silva, a 26-year-old Mexican woman in the country illegally, joined about 200 people who marched in Denver's spring snow, hoping for legislation that would ensure medical care for her 3-year-old autistic son.
"If you want to do something, you do it no matter what," Silva said. "There's still more work to do."
The crowds did not approach the massive demonstrations of 2006 and 2007, during the last serious attempt to introduce major changes to the U.S. immigration system. Despite the large turnouts six years ago, many advocates of looser immigration laws felt they were outmaneuvered by opponents who flooded congressional offices with phone calls and faxes at the behest of conservative talk-radio hosts.
Now, immigrant advocacy groups are focusing heavily on calling and writing members of Congress, using social media and other technology to target specific lawmakers. Reform Immigration for America, a network of groups, claims more than 1.2 million subscribers, including recipients of text messages and Facebook followers.
Gabriel Villalobos, a Spanish-language talk radio host in Phoenix, said many of his callers believe it is the wrong time for marches, fearful that that any unrest could sour public opinion on immigration reform. Those callers advocate instead for a low-key approach of calling members of Congress.
"The mood is much calmer," said Villalobos, who thinks the marches are still an important show of political force.
May Day rallies began in the United States in 2000 during a labor dispute with a restaurant in Los Angeles that drew several hundred demonstrators, said Angelica Salas, executive director of the Coalition for Humane Immigrant Rights of Los Angeles, which organized what was expected to be Wednesday's largest rally. Crowds grew each year until the House of Representatives passed a tough bill against illegal immigration, sparking a wave of enormous, angry protests from coast to coast in 2006.
The rallies, which coincide with Labor Day in many countries outside the U.S., often have big showings from labor leaders and elected officials.
Demonstrators marched in countries around the world, with fury in Europe over austerity measures and rage in Asia over relentlessly low pay, the rising cost of living and hideous working conditions that have left hundreds dead in recent months alone.
The New York crowd was a varied bunch of labor groups, immigrant activists and demonstrators unaffiliated with any specific cause. Among them was 26-year-old Becky Wartell, who was carrying a tall puppet of the Statue of Liberty.
"Every May Day, more groups that have historically considered themselves separate from one another come together," she said.
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