I would say that these are the two thesis statements best for a literary analysis essay on recurring themes in Shakespeare's Romeo and Juliet:
1. In Romeo and Juliet, Shakespeare demonstrates that love comes in a variety of forms, be it romantic, familial, or between friends.
2. Shakespeare explores the struggle for identity through the character of Juliet in his play Romeo and Juliet.
The other theses aren't reoccurring in this play.
Answer: Spain and Portugal
Explanation: The subject is the who or what of the sentence. It's what the sentence is about. In this sentence, the places that are occupying the Iberian Peninsula are Spain and Portugal.
