Final answer:
The Spanish established religious missions in Florida, while the British used the Indian slave trade to gain power. No information is provided about Tobias' trading or what he received in return.
Step-by-step explanation:
The Spanish and British crossed into Fernandina, Florida for different reasons. The Spanish established religious mission villages among indigenous tribes, such as the Guale, Timucua, and Apalachee Indians, to Christianize and acculturate them. On the other hand, the British used the Indian slave trade to gain power and presence in the southern colonies and the borderlands between British and Spanish settlements.
Regarding Tobias, there is no information provided about him in the given context, so it is unclear what he traded and what he received in return.