wats the name of the movie were a kids parents die and he runs away 2 a town wer it divided by race wit a line?

ok so i saw this movie in 5th grade and i could never remembe the name
in the movie the kid runs with like super speedand the town i divided
by a line in the middle of the sreet ad at th end he helps the town
realze that racism is wrong. i reeeeeeeeeally wanna know the nme so
could wach it again so if anyone knows please let me know