Here are some good links for learning about Martin Luther King, Jr.
Starts at Eight – videos and worksheets and booklist
Classical Composers Monthly – biographical information, videos of his actual speeches and worksheet resources
Epi Kardia – resources for studying about MLK, additional assignments including a lapbook, and a booklist
Free notebooking pages from NotebookingPages.com
We are also going to watch a movie about a brave little black girl who attempted to go to a white school and met terrible resistance from other students, teachers, and the whole town. Have you ever heard of Ruby Bridges? The movie about her is on YouTube here.
I hope you can get some good use from these resources.