Question: NextGen America was started by the environmentalist of what nationality?

Context paragraphs:
Edgar Wayburn: Edgar Wayburn (September 17, 1906 – March 5, 2010) was an environmentalist who was elected president of the Sierra Club five times in the 1960s.  One of America's legendary wilderness champions, Dr. Edgar Wayburn was a tenacious and tireless leader of the Sierra Club since the 1940s and perhaps the least-known yet most successful defender of America's natural heritage.

Captain America (1990 film): Captain America is a 1990 superhero film directed by Albert Pyun and written by Stephen Tolkin and Lawrence Block.  The film is based on the Marvel Comics superhero of the same name.  While the film takes several liberties with the comic's storyline, it features Steve Rogers becoming Captain America during World War II to battle the Red Skull, being frozen in ice, and subsequently being revived to save the President of the United States from a crime family that dislikes his environmentalist policies.

Latin Americans: Latin Americans (Spanish: "latinoamericanos" , Portuguese: "latino-americanos" , French: "latino-américains" ) are the citizens of the Latin American countries and dependencies.  Latin American countries are multi-ethnic, home to people of different ethnic and national backgrounds.  As a result, some Latin Americans don't take their nationality as an ethnicity, but identify themselves with both their nationality and their ancestral origins.  Aside from the indigenous Amerindian (aka Native American) population, all Latin Americans or their ancestors immigrated within the past five centuries.  Latin America has the largest diasporas of Spaniards, Portuguese, Black Africans, Italians, Lebanese and Japanese in the world.  The region also has large German (second largest after the United States), French, Chinese and Jewish diasporas.

Indian people: Indians are the people who are the nationals or citizens of India, the second most populous nation containing 17.50% of the world's population.  "Indian" refers to nationality, but not ethnicity or language.  The Indian nationality consists of many regional ethno-linguistic groups, reflecting the rich and complex history of India.  India hosts all major ethnic groups found in the Indian Subcontinent.  The diaspora populations with Indian ancestry, as a result of emigration, are somewhat widespread most notably in Asia and North America.

Liberian nationality law: The Republic of Liberia was founded by African slaves from North America by the American Colonization Society and returned to establish a republic on African soil.  Nationality law is given in the Aliens and Nationality Law of 1973, based on its 1847 Constitution.  Human rights activists have described current citizenship laws as explicitly racist, as it requires being black as a prerequisite to citizenship.  The first constitution allowed for women to transmit their nationality to their children, although multiple citizenship was not permitted nor is it permitted in revisions of the constitution.

Next Generation Air Transportation System: The Next Generation Air Transportation System (NextGen) is a new National Airspace System due for implementation across the United States in stages between 2012 and 2025.  NextGen proposes to transform America’s air traffic control system from a radar-based system with radio communication to a satellite-based one.  GPS technology will be used to shorten routes, save time and fuel, reduce traffic delays, increase capacity, and permit controllers to monitor and manage aircraft with greater safety margins.  Radio communications will be increasingly replaced by data exchange and automation will reduce the amount of information the air crew must process at one time.

Equal Nationality Act of 1934: The Equal Nationality Act of 1934 was an American law which allowed foreign-born children of American mothers and alien fathers who had entered America before age 18 and lived in America for five years to apply for American citizenship for the first time.  It also made the naturalization process quicker for American women's alien husbands.  This law equalized expatriation, immigration, naturalization, and repatriation between women and men.  However, it was not applied retroactively, and was modified by later laws, such as the Nationality Act of 1940.

Harita Kata: Harita Kata {హరిత కత } (Green Short Story) is a short story writing competition in Telugu literature started by Jagruthi Kiran Foundation in association with Kadhakelli- Monthly magazine in the year 2009.  Jagruthi Kiran Foundation is a prominent organisation promoting Environmental Awareness, that to through creative forms of literature in Telugu.  This is one of the activity of Paryavaran Kavitodyamam Paryavaran Kavitodyamam (Environment Poetry Movement) started in the year 2008., prominent Environmentalist, Poet started this movement to create awareness on Environment among people.

Tom Steyer: Thomas Fahr Steyer (born June 27, 1957) is an American hedge fund manager, philanthropist, environmentalist, liberal activist, and fundraiser.

NextGen America: NextGen America is an environmental advocacy nonprofit and political action committee created in 2013 by Tom Steyer supporting candidates and policies that take action against climate change.  It has typically criticized Republican candidates, but has also targeted Democrats who have failed to take a stance on climate change.  The organization has also been an opponent of the Keystone XL pipeline.

Supporting paragraphs: NextGen America Tom Steyer
Answer: American