They probably have citizenship Jus sanguinis (of blood) or Jus Soli (of soil) of those countries laws. Europe in general has strong Jus Sanguinis laws and Canada has strong Jus Soli laws, so that’s why your friends probably have dual citizenship. I know for sure that you can never lose your Irish citizenship.
However, The U.S. government does not have any strong Jus Sanguinis or even Jus Soli (Of soil) laws. If you become a naturalized citizen of any other nation, you automatically lose your American citizenship.
When Obama was adopted, he became a naturalized citizen of Indonesia. When you’re a naturalized citizen of another country, you automatically give up your U.S. citizenship. Therefore, he’s not a citizen of the United States of America, and that’s why probably, like I was hinting in my other thread, he committed perjury when he was applying for his bar exam. He didn’t want anybody to know that he used to be Barry Soetoro of Indonesia. If he did, he would have been deported from the United States of America.
Therefore, Barack Hussein Obama II, is not eligible for the office of the presidency of the United States of America.
Loss of citizenship (INA § 349, 8 USC § 1481)
Section 349 of the INA [8 USC § 1481] specifies several conditions under which US citizenship may be lost. These include:
becoming a naturalized citizen of another country, or declaring allegiance to another country, after reaching age 18;
serving as an officer in a foreign country's military service, or serving in the armed forces of a country which is engaged in hostilities against the US;
working for a foreign government (e.g., in political office or as a civil servant);
formally renouncing one's US citizenship before duly authorized US officials; or
committing treason against, or attempting or conspiring to overthrow the government of, the US.
The primary effect of recent developments in the US regarding dual citizenship has been to add the requirement that loss of citizenship can only result when the person in question intended to give up his citizenship.
At one time, the mere performance of the above (or certain other) acts was enough to cause loss of US citizenship; however, the Supreme Court overturned this concept in the Afroyim and Terrazas cases, and Congress amended the law in 1986 to require that loss of citizenship would result only when a potentially "expatriating" (citizenship-losing) action was performed voluntarily and "with the intention of relinquishing United States nationality".
On 16 April 1990, the State Department adopted a new policy on dual citizenship, under which US citizens who perform one of the potentially expatriating acts listed above are normally presumed not to have done so with intent to give up US citizenship.
Thus, the overwhelming majority of loss-of-citizenship cases nowadays will involve people who have explicitly indicated to US consular officials that they want to give up their US citizenship.
As a minor child the Zero had no say, and did not (near as as I can find) explicitaly renounce before officals and all that.
Your turn.
This is not true for several foreign countries, for which one can maintain a dual citizenship with the US. However, Indonesia is not one of them, so Obama would have lost any American citizenship he may have had when he became an Indonesian citizen. His becoming an Indonesian citizen would have negated any natural born US citizenship he may have enjoyed at birth, thus making him ineligible for president even if he were born in Hawaii, which seems doubtful.