Double Wedding Ring Quilt, unknown African American artist, 194?, shown here as part of the Boston Museum of Fine Arts' "Fabric of a Nation: American Quilt Stories" exhibition (image free under CC0)
The Library of Congress uses the formal subject heading African Americans to describe Americans of sub-Saharan African ancestry and the term Blacks to refer to Black individuals in countries outside of the United States.
Afro-American is a variant of African American that may be useful for research. Other potentially relevant terms include black, black people, and specific variants like black women, black men, etc.
In historical research, it can be helpful to know the terms used commonly to refer to American and non-American Black peoples during the time period you are researching. In early American history and into the early 20th century, many Americans used the term coloreds or colored people, which was gradually replaced by Negro, Negroes, and variants, used through the late 1960s. Depending on your research topic, you may want to try searching with a variety of terms that could apply to your intended research topic and time period.