To those who want to deport children of undocumented immigrants, and deprive kids born in the United States of citizenship because their parents are undocumented, they should be advised that they might in fact be advocating for the removal of the very people who will, in the future, be contributing to their retirement fund.

It is no longer news: even children are learning in school that in Western societies, the average age is rapidly increasing. We all know that in a dozen years or so, the amount of retirees will outnumber those of working age.

Countries in western Europe (e.g. Germany, Scandinavian countries) are trying to encourage an increase in birthrates. The Polish government even introduced "becikowe", which would give financial assistance to parents to encourage them to have kids.

Meanwhile in the U.S., not only is the expiration date for tax relief for families looming, a group of Republican congressmen has proposed eliminating the 14th Amendment to the Constitution, which would deprive a child born in the United States of American citizenship if their parents were undocumented. You feel like warning all those who support this move: "Be careful what you wish for."

There is no denying that such a proposal could happen—in economically difficult times, it is easy for people who are suffering from the crisis to place the blame on immigrants, believing that they are the source of all evil.

It is no secret that immigrants are not only more mobile, they also have children at a higher rate. While immigrants constitute just over 10 percent of the U.S. population, the parents of every fourth child born in the United States in 2008 were immigrants (legal or not). According to a study by the Pew Hispanic Center, 8 percent of babies born that year (340,000 out of 4.3 million) had undocumented parents.

Furthermore, the Pew Hispanic Center found that nearly 5.1 million children living in the United States have undocumented parents; 80 percent, or four million, of those kids are "citizens of the 14th amendment" (i.e. kids born in the United States). Meanwhile, over 10 million first generation children have parents who are legal immigrants.

Unfortunately, in the United States, the issue of population growth has ethnic and racial undertones. The birthrate among Latinos is much higher than those of whites or African Americans, which results from cultural and lifestyle differences, as well as a plethora of other variables. Thus, it is easy and common to argue about the rapid Hispanicization of America.

The economy, however, needs young people.

Those who, for their own convenience, fail to contribute to rejuvenating the next generation can only blame themselves. A constant and controlled population is indispensable for a healthy economy--from the industrial production sector (for example, filling demands for the production of diapers, baby food, clothing, etc.) to trade and education.

Now, with a huge wave of baby boomers (the over 70 million people born between 1946 and 1964) entering the post-production age, advocating the removal of families with children is simply insane, from a demographic standpoint. The Social Security System is already cracking at the seams and the average American lifespan is getting longer, further burdening public finances.

Thus, we should educate and assimilate the children of undocumented immigrants rather than casting them away. In a couple of years, only two or three people will be working for one retirement pension, not four—as it is now.

One does not need a Ph.D. in mathematics to be able to calculate what this means: in a couple of years, at least one child with undocumented parents will be working for every fourth American's pension.