The international role of the united states changed as a result of world warl what was the long-term
effect of this change?

The US is becoming the world's number one power.

Explanation:

After the First and Second World Wars, the United States came out on the side of the victorious countries. Their involvement in the First and Second World Wars directly changed the course of the war in favour of the Allies. Because of its crucial role in the two world wars, America emerges from the conflict as the most massive military power in the world and holds that position to this day.

In addition to the above, it is vital to highlight the political influence of the USA. Today, in political terms, it is also the number one world power. It was this authority that the United States built during World War I and World War II, so that today the United States is the most influential country in the world.

i believe the correct answer is option b. most eastern european nations joined nato.

though i could be wrong, option d. the eastern european nations were granted complete independence, would be another choice.

hope this ! : )