Why did landowners in the Virginia colony began to import enslaved Africans instead of using more indentured servants?

Landowners in the Virginia colony began importing enslaved Africans because they were seen as a more cost-effective and permanent source of labor compared to indentured servants, who only worked for a set period of time. Enslaved Africans also had a lifelong servitude that could be inherited, providing a more stable labor force for the landowners.