Asian American business leaders are launching a foundation to challenge discrimination through what they call the largest philanthropic commitment in history by Asian Americans geared to support members of their own community. The Asian American Foundation, which announced its launch on Monday, said it has raised $125 million from its board members to support Asian American and Pacific Islander organizations over the next five years. The foundation has also raised an additional $125 million from individual and corporate donors through its “AAPI Giving Challenge.”