The "liberation" of Seattle since, of course, it's shown in the ending camera sweep that the city is a bombed out uninhabitable ruin.*
In all honesty, though the end of the game is shown as a big win for the USA the Soviets are still very much in the fight. The NATO Atlantic Fleets are apparently hard pressed since they couldn't prevent a Soviet amphibious operation in the Mediterranean. China has somehow managed to sail an entire invasion fleet across the Pacific unopposed, so the Pacific Fleet was either gutted to reinforce NATO in the Atlantic, is sunk, or are complete incompetents. Either way, with the bulk of US forces in the European meatgrinder, China has free rein for the moment to do whatever it wants to do.
On the other hand, the Soviets can't really win either seeing as they don't really have war goals other than to conquer places and blow shit up. Seriously, there was almost zero justification for the war as presented in the game. Welp.
*In all fairness, the destruction of Seattle was at least half self-inflicted by my profligate use of artillery and carpet bombing....