Pretty sure B but it could be C
We take it for granted that the United States is the most powerful country on Earth today, and perhaps in human history. The story of how that came to be is long, fascinating, complex — and often misunderstood. Here, excerpted in part from "70 maps that explain America," are maps that help show some of the key moments and forces that contributed to the US's rise as sole global superpower.
Capitalism is not a system of government, but an economical system - so it can't be the correct answer.
The correct answer is" republic" - in a republic people don't exercise their power directly, but choose representatives and this is the case in the US (the representatives are for example the Congress and the President)
