The Liberation of Gabriel King
K.L. Going (2005)
Two friends, a brave black girl and a timid white boy, face bullies, racism, and spiders in 1976 Georgia. Nervous about going into 5th grade, Gabriel tries to spend the summer facing his fears and helps his friend Frita deal with racist adults. Feels like this could have been a much deeper, longer book with all the characters and plot points, but it's almost just a surface sketch. For younger readers it does bring up a lot of discussion-able issues without getting too heavy.
Definitely recommend. Vote for Carter.