Question: Which philanthropic cause did this American businessman, author, politician, and philanthropist who started the program "Opportunity NYC" join?
Context: The National Charity League Inc. is a charitable non-profit organization that has mother and daughter members in Chapters in the United States.  It was established in Los Angeles, California, in 1925 and was incorporated in 1958.  It is a philanthropic organization who deals mainly with community service, social development and cultural experience.  His story began in the year 1925 when a small group of women founded the organization in Los Angeles, California.  They supported the American Red Cross.  The women had their daughters support, and by 1938, the daughters formed their own group.  In 1947, both groups united to become a philanthropic organization, and started calling themselves the National Charity League.  NCL expanded its program beyond the philanthropic work to include leadership and cultural experience.  In 1958, the National Charity League was reorganized and was incorporated and renamed National Charity League, Incorporated. Michael Rubens "Mike" Bloomberg (born February 14, 1942) is an American businessman, author, politician, and philanthropist.  His net worth is estimated at US$ 53.4 billion, as of July 2017, ranking him as the 6th richest person in the United States and the 10th richest person in the world.  He has joined The Giving Pledge, whereby billionaires pledge to give away at least half of their wealth. Qasim Ibrahim (also known as "Buruma Qasim") is an Maldivian business magnate, philanthropist and politician.  In 1986, Ibrahim founded Villa Shipping and Trading Company Pvt. Ltd, the Maldives largest private conglomerate company.  Ibrahim is the chairman, and largest shareholder of Villa Group, and is one of the wealthiest businessman in the country.  He does his philanthropic activity through Villa Foundation, an philanthropic organisation, which helps Maldivians with Health and Educational difficulties by offering medical assistance and scholarships. Lloyd Eugene Rigler (May 3, 1915December 7, 2003) was an American businessman and philanthropist.  As a businessman, he and a partner, Lawrence E. Deutsch, made Adolph's Meat Tenderizer a national brand.  One of his notable philanthropic efforts was the establishment, in 1994, of the Classic Arts Showcase, a free, non-commercial television channel promoting the fine arts. Jon Meade Huntsman Sr. (born June 21, 1937) is an American businessman and philanthropist.  He is the founder and executive chairman of Huntsman Corporation, a global manufacturer and marketer of specialty chemicals.  Huntsman plastics are used in a wide variety of familiar objects, including (formerly) McDonald's clamshell burger containers.  Huntsman Corporation also manufactures a wide variety of organic and inorganic chemicals that include polyurethanes, textiles, and pigments.  Huntsman's philanthropic giving exceeds $1.5 billion, focusing on areas of cancer research, programs at various universities, and aid to Armenia. Opportunity NYC was an experimental Conditional Cash Transfer program (CCT) by the Mayor of New York City, Michael Bloomberg.  Announced in April 2007, it was the first CCT program to be launched in the United States or any other developed nation.  Its initial phases were funded by a number of private partners including The Rockefeller Foundation, Robin Hood Foundation, the Open Society Institute, Starr Foundation, AIG, and Mayor Bloomberg's own Bloomberg Family Foundation.  The program is being evaluated by MDRC, a nonprofit research firm, using a random assignment research design.  Opportunity NYC is administered by Seedco, a nonprofit community development organization.  The program ended on August 31, 2010. Julius Rosenwald (August 12, 1862 – January 6, 1932) was an American businessman and philanthropist.  He is best known as a part-owner and leader of Sears, Roebuck and Company, and for establishing the Rosenwald Fund, which donated millions in matching funds to support the education of African American children in the rural South, as well as other philanthropic causes in the first half of the 20th century.  He was also the principal founder and backer for the Museum of Science and Industry in Chicago, to which he gave more than $5 million and served as President from 1927 to 1932. Robert J. O'Donnell (1891–1959) was an American businessman and philanthropist who, with partner Karl Hoblitzelle, managed the Interstate Theater chain as vice president and general manager from 1925 until his death from lung cancer in 1959.  O’Donnell is best known for helping facilitate the growth of the "Majestic" chain of theaters during the "classical Hollywood narrative" and later for his philanthropic work both with the Variety Club Children’s Charity and the Robert J. O'Donnell Film Series Endowment Fund for the Dallas Museum of Fine Arts. American Securities LLC—originally named "American Securities Capital Partners (ASCP)" 1994 - 2008—is a leading U.S. private equity firm—based in New York with an office in Shanghai—that invests in market-leading North American companies with annual revenues generally ranging from $200 million to $2 billion and/or $50 million to $200 million of EBITDA.  American Securities and its affiliates have approximately $15 billion under management.  American Securities traces its roots to a family office founded in 1947 by William Rosenwald, the son of Julius Rosenwald (August 12, 1862 – January 6, 1932).  Julius Rosenwald was an American businessman and philanthropist.  He is best known as a part-owner and leader of Sears, Roebuck and Company, and for establishing the Rosenwald Fund, which donated millions in matching funds to support the education of African American children in the rural South, as well as other philanthropic causes in the first half of the 20th century.  He was also the principal founder and backer for the Museum of Science and Industry in Chicago, to which he gave more than $5 million and served as President from 1927 to 1932. Arthur Ross (November 25, 1910 – September 10, 2007) was an American businessman and philanthropist.  He was known for his philanthropic contributions to the arts and environmental causes, including New York City's Central Park, specifically the Arthur Ross Pinetum.
Answer: The Giving Pledge