What made a navy ready for war in 1939?

Which major navies were best prepared when the Second World War began?

Italy, Britain, and the United States each had strengths, but no navy combined adequate ships, resources, and support infrastructure so completely as to be fully ready.

Readiness depended on more than the number or quality of warships. Italy had useful naval preparation but insufficient resources, while Britain combined ship orders with a worldwide fuel-storage and support network. The United States was still building toward readiness, and smaller forces had even sharper constraints. None of the navies possessed complete strength in both ships and infrastructure when war began. Combat fleets must be judged alongside the fuel, bases, and support systems that sustain them.