Final answer:
Spain's overseas empire began to lose economic viability due to slave rebellions, depletion of silver mines, disease affecting sugar crops, and colonial challenges from Portugal.
Step-by-step explanation:
Spain's overseas empire began to lose its economic viability due to several factors:
- Slave rebellions threatened sugar production: In many Spanish colonies, sugar production relied heavily on enslaved labor. Slave rebellions, such as the Haitian Revolution, disrupted the sugar industry and caused economic decline.
- Its American silver mines ran out of silver: The Spanish empire heavily relied on the wealth extracted from silver mines in the Americas. As the silver mines depleted, so did Spain's economic resources.
- Disease killed off its sugar crops: Diseases, such as the introduction of sugarcane diseases from other regions, devastated Spain's sugar crops and affected its economic viability.
- Portugal challenged Spain's colonial holdings: Portugal, another European power, challenged Spain's control over its colonial territories, leading to conflicts and further weakening of Spain's economic position.