Legitimacy: How was t U.S. military perceived?

According to IB: Legitimacy refers to an actor or an action being commonly considered acceptable and provides the basis for all forms of governing and exercising power over others. The most accepted source of legitimacy in a state is some form of democracy or constitution which gives the citizens an opportunity to choose who they wish to exercise power over them. Non-democratic states offer other explanations of their legitimacy. Furthermore, individual actions by a state can be considered more or less legitimate. Other actors of global politics and their actions can also be evaluated from the perspective of legitimacy.

Legitimacy (合法性)

Actor: Here, actor refers to "political actors." A political actor is not a performer, but a participant: anyone involved in a political issue. Countries, organizations, companies, and even something like a terrorist group are all political actors.

Constitution (憲法): A written document that sets up how a country's government operates. Taiwan and the U.S. are both constitutional republics (立憲共和國)

Other actors: Again, anyone or anything involved in a political issue (local, national, or global) is a political actor. YOU can be a political actor.