Fortifications and submarines close the treaty series for different reasons. Pacific bases and defenses received detailed attention at Washington, while the London settlements largely left that arrangement alone. Submarines remained subject to repeated British ban proposals and detailed tonnage and armament limits. One arms-control issue carried forward by inertia, while the other stayed under active negotiation.
Notable Point · 2:47-3:04
The fortification freeze carried into the London treaties
The Washington Treaty made Pacific fortifications a major bargaining issue, but the later London treaties largely left that settlement unchanged.