Ah now, sorry, the USA is certainly not in its best period ever now; not for the economy (USD at 18-year low against the pound and many years against the euro, almost all big airlines and car companies bankrupt...), not for politics (the USA has never so hated and unpopular in the world as now), nor for culture (the American dream is not what it used to be).
Up to 1990 Japan was doing very well economically, but things have been rather gloomy since then. Politically Japan is far from being comfortable and well-respected on the international scene (Asian neighbours ?). Culturally it seems that the more time passes and the more Japan is becoming Westernised. Just look at what people are wearing (European clothes), what movies or series they are watching (mostly American, with a recent increase in Korean ones too), or what food they are eating (very few traditional Japanese dishes but many hybrid ones inspired from foreign cuisines, always more European and American food).Although I would tend to think of either the Edo Period or Meji as "Golden Ages" (can you have more than one?) the current era has to rank pretty high.
That doesn't necessarily coincide with a period of golden age. The country has to expand, be innovative, inspire or influence the rest of the world, be a world leader in the arts and sciences, etc. I do not see much Japanese influence outside Japan except for cars and very specialised markets (mostly manga and video games). They are not the one who make the fashion, who lead the world literature and cinema, who dominate scientific research, who have the most advanced legal system, or whatever. In fact, Japan has never dominated even East Asia, except from the Meiji period to WWII. Its influence in management, economy and even culture were stronger in the 1980's than now. It was the "Japanese miracle", while now the international media talk more about the land of the setting sun.In Japan, they have had six decades of peace, prosperity and growth since 1946 that is pretty amazing.
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