“The answer to ‘Which country is the easiest to get citizenship in?’ is not necessarily a simple one and will depend on individual factors. There is no one-size-fits-all solution. Generally speaking for most people, though, the easiest, fastest, and least costly path to obtaining a citizenship in another country and a second passport is through a citizenship-by-ancestry program. Each country that has such a program has its own eligibility requirements and procedures. Of course, you have to be lucky enough to have verifiable heritage in the select countries that offer such programs. In fact, Italy’s citizenship-by-ancestry program is how I attained my second passport.”
http://www.internationalman.com/articles/the-easiest-country-to-get-citizenship-in