The process of preparing the US army and people for World War I was called propaganda.
recruiting.
rationing.
mobilization.

Propaganda would not be the correct answer, as propaganda is biased information, usually used to promote a political point of view towards the public. This definition does not match with the question.

Recruiting would not be the correct answer, as recruiting is when you enlist someone into the army. This definition does not match with the question.

Rationing would not be the correct answer, as rationing generally means saving a limited amount of something by allowing each person to have a certain amount. This definition does not match with the question.

Mobilization would be the correct answer, as mobilization is the government preparing troops for things like war. This definition does in fact match with the question.

the answer to your question is ( syngman rhee) have a great day

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.