Mostly, empires get soft from the middle. The military and economy is still so strong that as the people get soft after generations of cushy living, they’re still protected by the hard exterior, until finally some internal calamity brings the rottenness of the whole edifice into view, and adversaries start picking off the loose pieces from the edges as they gradually fade away over time after the collapse.
You could say that’s what’s happening here, but definitely Russia’s espionage and propaganda operation that put Trump in charge is a huge coup while the US is still pretty strong at the edges. They found a way through the barricades to strike at the rotten spot, and they’re nowhere near done twisting the knife to maximize the damage.
If anyone’s curious, it takes GM 2.6 minutes to make $500k of gross income.