No question about it, Wheatley is concerned with race in "On Being Brought from Africa to America." But not the kind of race you win medals for. With a title about being brought to America on a slave ship, and phrases like "sable race" and "diabolic die," we've got a poem weighted with racial tensions in America during the eighteenth century, especially between blacks and whites. Wheatley boldly addresses her belief in equality among races throughout the poem, and shows how her conversion to Christianity is proof that all people are equal, regardless of their skin color.
Wheatley's race isn't to the finish line first, but she knows being black in America was something that should not disqualify her from being treated as an equal.
Through her use of imagery, Wheatley portrays her race as something seen as both negative and positive during her lifetime. It's not that she couldn't make her mind up. Instead, this back-and-forth emphasizes the racial tensions between black and whites in America.