Hegemonic countries

Knowing that America is a hegemonic country at the present time,  describe what are the factors of becoming a hegemonic country militarily and economically. Describe the characteristics and advantages and disadvantagdes and responsibilities of a hegemonic country and also describe a catch-up country you can talk about the pereiphiric, semi-perephiric and core countries and give examples. You should use two books atlas as sources to confirm your content