Sea power and South American alignment

How seriously should the United States and Britain treat expanding Chinese influence in South America?

Influence matters, but its wartime value depends on the ability to sustain partners across the sea and on the economic costs those partners accept.

Prewar German influence in South America did not translate into wartime alignment because Germany could not protect or supply distant partners against British sea power and US pressure. Brazil's regional weight also limited what a pro-German alignment elsewhere could achieve. The same test applies to modern Chinese influence: commercial ties and arms sales matter less if China cannot sustain partners across contested oceans. Western components, export vetoes, and access to American markets further complicate any attempt to divide the region into separate economic blocs.