How were slave systems different under Spanish, British and American rule? Objective Student will: Activate prior knowledge and organize brainstormed ideas using bubble thinking maps. Identify the main idea of a slave narrative excerpt. Compare and contrast the American and Spanish systems of slavery using double bubble thinking maps. Analyze family structures and changes over time using historical inventories and accounting records. Compose a document-based essay comparing and contrasting the American and Spanish systems of slavery. Preparation Materials needed: Student paper, pens/pencils A Duration: 90 Minutes.