Question: the incas came to south america in the 15th century
About the article "Peru", section "History".

Candidate passages:
The Wari' people conquered earlier cultures in the highlands.
They established the administrative center of Wiraquchapampa.
In the 15th century, the Incas conquered the territory, expanding their empire.
They established their regional capital in what is now Cajamarca.
The Incas in 1465 established a new province there to serve as a bridge to their later conquests.
Cajamarca had long been one of the oldest cities in South America when the Spanish arrived in their conquest of Peru. 
From the mid to late 15th century, the Incas established forts in northern and central Chile, from the far north to near where the city of Rancagua stands today.
Under the helm of the Incas, these parts of Chile were in the "Qullasuyu" (Quechua for southern region), the south-eastern province of the Inca Empire.
"Qullasuyu" is also the region of the Qulla, named after a subgroup of the Aymara whose kingdom stretched from what is now northern Chile to central Bolivia before their territory was annexed by the Incas.
The "Qullasuyu" extended from Cusco to central Chile, where its advance southwards was halted after the Battle of the Maule when the Incas met determined resistance by Mapuche warriors, and the final border was fixed as being this area.
The "Qhapak Ñan", or Inca road network, ran from southern Colombia deep into Chile along the Andes, with an intermittent parallel route along the Pacific coast and various branches and side roads linking the two or extending into Argentina and Bolivia.
These side roads which linked the main highways followed an east to west orientation in line with the daily route of the sun, which the Incas worshiped as a god.
The Spanish later incorporated the local branches of the Kapak Ñan into the "Camino Real a la Frontera", the highway linking Santiago and Concepción. 
Since the Inca Empire lacked a written language like English, the empire's main form of communication and recording came from quipus, ceramics and spoken Quechua, the language the Incas imposed upon the peoples within the empire.
The plethora of civilizations in the Andean region provided for a general disunity that the Incas needed to subdue in order to maintain control of the empire.
While Quechua had been spoken in the Andean region, like central Peru, for several years prior to the expansion of the Inca civilization, the type of Quechua the Incas imposed was an adaptation from the Kingdom of Cusco (an early form of "Southern Quechua" originally named Qhapaq Runasimi = The great language of the people) of what some historians define as "Proto-Quechua" or Cusco dialect (the original Quechua dialect).
The language imposed by the Incas further diverted from its original phonetic tone as some societies formed their own regional varieties, or slang.
The diversity of Quechua at that point and even today does not come as a direct result from the Incas, who are just a part of the reason for Quechua's diversity.
The civilizations within the empire that had previously spoken Quechua kept their own variety distinct from the Quechua the Incas spread.
Although these dialects of Quechua have a similar linguistic structure, they differ according to the region in which they are spoken.
Although most of the societies within the empire implemented Quechua into their lives, the Incas allowed several societies to keep their old languages such as Aymara, which still remains a spoken language in contemporary Bolivia where it is the primary indigenous language and various regions of South America surrounding Bolivia.
The linguistic body of the Inca Empire was thus largely varied, but it still remains quite an achievement for the Incas that went beyond their time as the Spanish continued the use of Quechua. 
 Afonso de Paiva (15th-century/16th-century diplomat and explorer in Ethiopia) Fernão de Noronha (15th-century/16th-century explorer of the Atlantic) Gaspar de Lemos (15th-century/16th-century explorer of the Atlantic and of the sea route to Brazil) Gonçalo Coelho (15th-century/16th-century explorer of the South American coast) João Fernandes Lavrador (15th-century/16th-century explorer of North America) Pêro da Covilhã (15th-century/16th-century diplomat and explorer in Ethiopia and India) Pêro de Barcelos (15th-century/16th-century explorer of North America)  
The Incas in their expansion used the Pucará de La Compañia, which they strengthened.
The Pcará was the southernmost Inca settlement then known.
Inca expeditions in this territory were organized by Túpac Inca Yupanqui at the end of the 15th century and later by Huayna Cápac.
The history of this period is based on what was written in later chronicles.
These chronicles indicate that the Promaucaes, informed about the coming of the Incas, allied themselves with the Antalli, Pincu and Cauqui subgroups, forming an army of 20,000 men.
The Incas sent members of parliament in order that they recognize Túpac Inca Yupanqui as sovereign.
The Purumaucas decided to face them in the so-called Battle of the Maule.
During the confrontation, both sides suffered many fatalities and neither army won a clear advantage.
On the fourth day, neither side left their own camp, both of which had been fortified, as they hoped to defend them if their opponents attacked.
The fifth and sixth days were passed in the same manner but by the seventh, the Purumaucas and their allies retired and returned home claiming victory.
The Incas later considered chasing them, on which some chiefs agreed; but they decided to secure only what they had already conquered, with which Túpac Inca Yupanqui agreed.
Due to their proximity to the Inca Empire, the Promaucaes learned the new technology that the Incas displayed in their new domains.
Among the peoples the Spanish called the Promaucaes were particularly the people of the Rapel River valley.
Those of the Mataquito River valley were called the "Cures", for which the province of Curico is named.
The people in the Maule River valley and to the south were distinguished as "Maules."
Those to the south of the Maules and north of the Itata River were known as "Cauqui" by the Inca or "Cauquenes."
The Spanish named the Cauquenes River after them.