Here are some great activities to get students to examine the speech "I Have a Dream" in Spanish. Using an excellent translation found online, students will unscramble vocabulary, find the sentences with the vocabulary in the speech, and then translate those sentences into Spanish. The unscramble activity can be giving with out without hints depending on the level of Spanish. You may choose to only do the unscramble as a shorter activity, or add the translations to extend the activity.
Here is the link to the speech: https://www.um.es/tonosdigital/znum7/relecturas/Ihaveadream.htm