Basically everybody can win a green card in the official DVLottery. The only exceptions are persons born in a country with a very high rate of emigration into the US.
One’s country of citizenship is not important in this process. What is most important is the country of your birth, in accordance with current world political maps
Bangladesh, Brazil, Canada, (People’s Republic of) China (mainland born, except Taiwan and Hong Kong SAR, Macau SAR), Colombia, Dominican Republic, Ecuador, El Salvador, Haiti, India, Jamaica, Mexico, Nigeria, Pakistan, Peru, Philippines, South Korea, United Kingdom/Great Britain (except Northern Ireland) and its dependent territories, and Vietnam.
Individuals who were born in any of the above-mentioned excluded countries may apply if their spouses were born in one of the DV-2015-eligible countries, or if the individuals were born in an excluded country while parents (both not born in this excluded country) of said individuals were only temporary residents of the excluded, non-eligible countries.
The only other requirement is a certification of completion of secondary school education (comparable to the US high school diploma) or a minimum of two years’ work experience (within the past five years) in a profession which requires at least two years of training. Proof of these prerequisites are only necessary when and if a lottery participant wins a GreenCard. They are not necessary when you are simply submitting the application.
12 years of high-school
If you do not have the equivalent of a high school degree and are not sure if your job "requires two years of training" you should check the US Department’s of State Online Database ONET by clicking here. Type in your profession and click on "Summary". You will find an analysis on how many years of experience in your job are needed in the chapter "Job Zone > Overall Experience"
You must list your partner/spouse (if you are married) and all your children under 21 years on your DVLottery application. Your spouse´s children must be listed too! Photos must be provided of all family members on the application!
This does not mean that all family members have to immigrate to the US. After winning, the principal applicant can decide who to take along or not! However, all family members must be listed on the initial DVLottery application to avoid disqualification!
The congressionally mandated Diversity Immigrant Visa Program is administered on an annual basis by the Department of State and conducted under the terms of Section 203(c) of the Immigration and Nationality Act (INA). Section 131 of the Immigration Act of 1990 (Pub. L. 101-649) amended INA 203 to provide for a new class of immigrants known as "diversity immigrants" (DV immigrants). The Act makes available 50,000 permanent resident visas annually to persons from countries with low rates of immigration to the United States.
From the State Department: "Alien petitioners for the Diversity Visa Program will no longer be permitted to submit a petition by mail. Instead, the Department will require that all petitions be submitted to it in an electronic format, using an Internet website dedicated specifically to the submission and receipt of Diversity Visa."