Geography decides an Italian-South American contest

Who would win between the 1930s Italian fleet and the South American navies?

South America in the Atlantic because of range; Italy in the Mediterranean because of organization, modernization, and local logistics.

In the Atlantic, the South American navies possess the range and local basing to outlast Italy's short-legged capital ships. The Italians would face a fuel problem before their better organization could decide the contest. In the Mediterranean, the calculation reverses because Italian bases and limited operating distances remove that disadvantage. Italy's stronger officer corps, fleet organization, and modernized ships could then operate on favorable logistical ground. Theater and sustainment matter more here than a simple count of hulls.