African Americans [ ... ] are a racially mixed or mulatto people—deeply and overwhelmingly so" (see genetics). After the Emancipation Proclamation, Chinese American men married African-American women in high proportions to their total marriage numbers due to few Chinese American women being in the United States. African slaves and their descendants have also had a history of cultural exchange and intermarriage with Native Americans, although they did not necessarily retain social, cultural or linguistic ties to Native peoples. There are also increasing intermarriages and offspring between non-Hispanic blacks and Hispanics of any race, especially between Puerto Ricans and African Americans (American-born blacks).
Chinese Americans the graduate students. Chinese international students tend to gravitate towards technical and scientific majors that involve heavy use of mathematics, engineering and the natural sciences. 27.5% of international Chinese students study business management, finance, or economics, 19.2% study engineering, 11.5% study the life sciences and 10.6% study math or computer science. Largely driven by educational immigration, among American PhD recipients in fields related to science and engineering, 25% of the recipients are ethnic Chinese. According to the Pew Research Center in 2015, 54% of Chinese Americans had a bachelor's degree or more. 27% of all Chinese Americans, aged over 25,