That is because the Spaniards controlled the seas.
Because they rushed the treaty then it later failed.
Human-Technology Symbiosis; Human-Environment Interactions; Ethics, Privacy and Security; Well-being, Health and Eudaimonia; Accessibility and Universal Access; Learning and Creativity; and Social Organization and Democracy.
Answer: C. Labor unions
Hope this helped!!... :D
Please correct me if I'm wrong!!.. :3