Answer
Civil war erupted between Almagro and Francisco Pizarro due to a disagreement over the distribution of Inca wealth and territory. Almagro claimed the southern part of the Inca Empire, which Pizarro disputed. The conflict escalated into armed clashes, resulting in Almagro's defeat and execution in 1538. This civil war weakened the Spanish presence in Peru and paved the way for further internal conflicts among the conquistadors.