According to Naij.com, the Immigration Act of 1990 established the current and permanent Diversity Visa (DV) program.
The lottery is administered by the Department of State and conducted under the Immigration and Nationality Act (INA) as amended by the Immigration Act of 1990.
The lottery makes available 50,000 permanent resident visas annually and aims to diversify the immigrant population in the United States, by selecting applicants from countries with low rates of immigration in the five years prior.
Currently, countries that have sent 50,000 or more immigrants to the US in the previous five years are not eligible.
Below is a list of countries that cannot enter for the 2019 lottery:
4. China (mainland born)
6. Dominican Republic
7. El Salvador
16. South Korea
17. United Kingdom (except Northern Ireland) and its dependent territories