We're living those days right now. Compare today to early 1990s whn the Berlin Wall fell, USSR crumbled and the USA was the uncontested master of the entire planet--its night and day.Yeah every empire falls. It may not be in our lifetime but there will be a day when the US is not the strongest nation on earth.
The MIC got so bored of being powerful in that era that they had to "prop up" Russia and make it seem like they were still so powerful. Had to engineer the War on Terror which led to the Bush years etc. Today they can't even topple an unpopular president like Maduro in Venezuela.
Anthony Blinken himself made a speech a few weeks ago admitting that the Post cold war world order is over. And the USA wants to be a major player in the new one coming.