Sea power tends to be more aggressive and expansive, but land power tends to last longer:
If you look at ancient history, the rivalries between Athens and Sparta, and between Carthage and Rome, all ended the same way; with the land power eventually defeating the sea power. This is because sea power is intrinsically offensive, which means that it doesn’t have much in the way of defense in depth once its advantages are counteracted in one way or another.
It’s already apparent that either China or Russia can defeat the USA in a war. Which means that the US is an empire in decline, and the only real question is how fast it will collapse and how far.
