Which group had most reason to be concerned about the idea of manifest destiny ?

Native americans in the west in a nutshell

yes ap politics. what do you need?

the answer to fill in the blank in this question would be the word resource, it is defined as the money, material or people (since human resource is a very valuable good) that a company or a person has at disposition (meaning they can use the resource as they see fit), to be able to complete a task or achieve a goal.