South American naval power tested the Monroe Doctrine

How did the South American naval race affect the Monroe Doctrine?

It exposed the gap between US claims and US naval strength and increased pressure on Washington to adopt a harder line. Roosevelt-era shipbuilding later gave the policy greater credibility against European intervention.

The Monroe Doctrine depended on naval capabilities that the United States did not always possess. Strong South American fleets made Washington's claims look weak at several points. Theodore Roosevelt's political arguments helped drive a shipbuilding buildup that later allowed the United States to face German pressure over regional debts in the early twentieth century. Without that expansion, another South American country might have become the major power confronting Germany. South American naval growth affected both the credibility of United States hemispheric policy and the pressure on Washington to enforce it more firmly. The closing remarks stress how much those navies achieved on limited budgets.