I believe the answer is: positive externality
Positive externality refers to The benefit that enjoyed by a third party when the first and second party are conducting a transaction.
When you receive a vaccines, you prevent yourself from becoming a host that could contaminate other people from getting the virus. In the example above, you and your children are the first and second party. And other children are the third party.
Answer:
Although the Spanish were greatly outnumbered, their guns and steel weaponry gave them an overwhelming advantage.
Explanation:
I hope this is helpful!
If by Christian Church you mean Catholic Church(as their was and is the Eastern Orthodox, which historically didn't get along well with Catholics) then the Reformation.