Comparing North and South: Why Outcomes Differed

Why did the United States emerge as a single, relatively stable republic while Spanish America fragmented into many states? Historians offer several explanations. The thirteen colonies had long experience of elected assemblies, while Spanish America had been governed through viceroys and royal courts. The American war lasted eight years and largely spared the colonies' cities from total destruction, while Spanish American wars lasted about fifteen years and devastated economies.

The US had one dominant language, religion and legal tradition, whereas Spanish America's vast geography separated regions. Social composition mattered too: Spanish America had larger Indigenous and mixed populations, and elites feared social revolution. Some historians caution against treating the US as the norm and Spanish America as a failure, noting that Spanish American constitutions often abolished slavery earlier and that the US also faced a civil war.