While many Americans of Irish or Italian descent are familiar with the ability to acquire dual US-EU citizenship based on ancestry, far fewer are aware that Luxembourg is another EU country having a program of ancestry-based citizenship.
Luxembourg's program is open until 2018.
A lot of people in parts of the Upper Midwest of the US, for example, who think of themselves to be of German ethnic heritage may not know that they may actually be, in whole or part, of Luxembourg heritage since the US procedure at times was to register arriving immigrants on the basis of language spoken rather on the basis of country of origin. Many such Americans qualify for Luxembourg citizenship, and the cost to do this has sometimes been not even over a $1000.
http://washington.mae.lu/en/Consular...al-citizenship
For the growing number of US citizens who ought to be concerned about the ability of the US government to deprive them of a US passport despite their status as being otherwise free to travel: dual-citizenship and passports from countries of both/all citizenships is a measure to maximize international mobility.