Why did Inca decline?
The Incas were a well civilized race, however they still had their downfalls. The man who conquered this fierce tribe was Pizarro. He didn't just conquer them with pure force though. Before Pizarro arrived a great civil war had occurred, leaving the Inca military weak, which made it easy for Pizarro to destroy them. Pizarro had taken Atahualpa, the Incan leader, captive. The incas bribed Pizarro with a room filled with gold for Atahualpa, however once Pizarro received it he still ordered that Atahualpa to be killed. It took Pizarro approximately 40 more years until the last Inca was killed, his name was Tupac Amaru, Pizarro ordered that his body be dismembered to stop any further Inca resistance.
The Spaniards led to the decline of the Inca civilization. The Spaniards took Atahualpa (ruler at the time,) hostage and killed his brother Huascar. Then they installed a new leader Atahualpa's brother, Manco Inca. He eventually passed on the throne to his son Tupac Amaru. When the Spaniards captured and executed him, the Inca's resistance to the Spaniards ended.
it came to an end at about 1532 because the Spanish conquistadors under Francisco Pizarro invaded the Inca empire and killed the Inca ruler Atahualpa. The Spanish also brought diseases, causing the Inca civilization to decline and eventually be absorbed into Spanish culture. Spain gained riches from the Inca gold and silver.
The conquistadors consolidated their power over the whole Andean region, repressing successive Inca rebellions culminating in the establishment of the Viceroyalty of Perú in 1542. 1572 saw the fall of the last of the Incas and the end of their resistance in Vilcabamba. Their civilization ended at that time, but cultural traditions remain in some ethnic groups such as the Quechuas and Aymara people. ( Wikipedia ).