?All I want is a better life,? she said after the Border Patrol found her hiding in bushes on the Arizona side of the border with her husband, her young son and her very pronounced abdomen.
The next big immigration battle centers on illegal immigrants? offspring, who are granted automatic citizenship like all other babies born on American soil. Arguing for an end to the policy, which is rooted in the 14th Amendment of the Constitution, immigration hard-liners describe a wave of migrants like Ms. Vasquez stepping across the border in the advanced stages of pregnancy to have what are dismissively called ?anchor babies.?
The reality at this stretch of the border is more complex, with hospitals reporting some immigrants arriving to give birth in the United States but many of them frequent border crossers with valid visas who have crossed the border legally to take advantage of better medical care. Some are even attracted by an electronic billboard on the Mexican side that advertises the services of an American doctor and says bluntly, ?Do you want to have your baby in the U.S.??
Women like Ms. Vasquez, who was preparing for a desert delivery, are rare.
Still, Arizona ? whose tough law granting the police the power to detain illegal immigrants is tied up in the courts ? may again take the lead in what is essentially an effort to redefine what it means to be an American. This time, though, Arizona lawmakers intend to join with legislators from other states to force the issue before the Supreme Court.
This coalition of lawmakers will unveil its exact plans on Wednesday in Washington, but people involved in drafting the legislation say they have decided against the painstaking process of amending the Constitution. Since the federal government decides who is to be deemed a citizen, the lawmakers are considering instead a move to create two kinds of birth certificates in their states, one for the children of citizens and another for the children of illegal immigrants.
The theory is that this could spark a flurry of lawsuits that might resolve the legal conflict in their favor.
?This is not a far-out, extremist position,? said John Kavanagh, one of the Arizona legislators who is leading an effort that has been called just that. ?Only a handful of countries in the world grant citizenship based on the GPS location of the birth.?
Most scholars of the Constitution consider the states? effort to restrict birth certificates patently unconstitutional. ?This is political theater, not a serious effort to create a legal test,? said Gabriel J. Chin, a law professor at the University of Arizona whose grandfather immigrated to the United States from China at a time when ethnic Chinese were excluded from the country. ?It strikes me as unwise, un-American and unconstitutional.?
The 14th Amendment, adopted in 1868, was a repudiation of the Supreme Court?s 1857 ruling, in Dred Scott v. Sandford, that people of African descent could never be American citizens. The amendment said citizenship applied to ?all persons born or naturalized in the United States, and subject to the jurisdiction thereof.?
In 1898, the Supreme Court, in United States v. Wong Kim Ark, interpreted the citizenship provision as applying to a child born in the United States to a Chinese immigrant couple.
Still, some conservatives contend that the issue is unsettled. Kris Kobach, the incoming secretary of state in Kansas and a law professor at the University of Missouri-Kansas City who has helped draft many of the tough immigration regulations across the country, argued that the approach the states were planning would hold up to scrutiny.
?I can?t really say much more without showing my hand,? Mr. Kobach said in an e-mail. ?But, yes, I am confident that the law will stand up in court.?
The legal theories are lost on Laura Gomez, 24, who crossed into Arizona from Mexico five years ago while expecting and is now pregnant with her second child. But like many other pregnant women in Arizona who are without papers, she has been following the issue with anxiety.
?It doesn?t seem fair to just change the rules like that,? Ms. Gomez said.
Despite being called ?anchor babies,? the children of illegal immigrants born in the United States cannot actually prevent deportation of their parents. It is not until they reach the age of 21 that the children are able to file paperwork to sponsor their parents for legal immigration status. The parents remain vulnerable until that point.
This article has been revised to reflect the following correction:
Correction: January 4, 2011
An earlier version of this article incorrectly stated the year that the Supreme Court, in United States v. Wong Kim Ark, applied the citizenship provision to a child born in the United States to Chinese immigrants; it was 1898.
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