Requirement for the DV green card lottery program:

You or your spouse must be a native of a country that is eligible to participate in the Diversity Visa Lottery. You may also be eligible to apply if your parent was born in a country that is eligible to participate. (The State Department will publish the names of countries that are eligible to participate before each year's lottery.)

You must have a high school diploma or the equivalent, defined in the United States as successful completion of a 12-year course of elementary and secondary education; OR you must have two years of work experience within the last five years in an occupation that requires at least two years of training or experience to perform

List of countries that were not eligible for last year's lottery:

Anguilla, Bermuda, Brazil, British Virgin Islands, Canada, Cayman Islands, China mainland, Colombia, Dominican Republic, El Salvador, Falkland Islands, Gibraltar, Haiti, India, Jamaica, Mexico, Montserrat, Pakistan, Peru, Philippines, Pitcairn, Poland, Russia, South Korea, St. Helena, Turks and Caicos Islands, United Kingdom, United States, Vietnam.