Original: The kingdom of Castile (Castilla) built a global empire, spreading its culture and language in the Americas and biologically and culturally mixing with the Indigenous peoples and ultimately, the African slaves, altering the composition of the hemisphere.
Simplified: The kingdom of Castile (Castilla) built a global empire, spreading their culture and language in the Americas and biologically and culturally mixing with the indigenous peoples, altering the composition of the hemisphere.