The united states take a more active role in world politics after world war II as countries such as great Britain and France were no longer powerful enough to police the globe. Thus option 3rd is correct.
Politics refers to the involvement of those activities that are helpful in ruling the nation. It helps to maintain the peace in the country as well as with the other neighboring countries.
The US played the active role inn the world politics as Britain and France lost their powers and the United States emerged as one of the two major superpowers.
In matters of economics, politics, the military, culture, and technology, the United States rose to prominence. Thus it started taking participation in the world politics.
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