TheΒ history ofΒ Peru spans 10 millennia, extending back through several stages of cultural development along the country’s desert coastline and in theΒ AndesΒ mountains. Peru’s coast was home to theΒ Norte Chico civilization, the oldest civilization in theΒ AmericasΒ and one of the sixΒ cradles of civilizationΒ in the world. When the Spanish arrived in the sixteenth century, Peru was the homeland of the highlandΒ Inca Empire, the largest and most advanced state inΒ pre-ColumbianΒ America. After the conquest of the Incas, theΒ Spanish EmpireΒ established aΒ ViceroyaltyΒ with jurisdiction over most of itsΒ South AmericanΒ domains. Peru declaredΒ independence from Spain in 1821 but achieved independence only after theΒ Battle of AyacuchoΒ three years later.
Although Peru’s seaboard is situated well within theΒ tropicalΒ zone, it does not display an equatorial climate; average temperatures range from 21° CΒ (70° F) in January to 10° CΒ (50° F) in June at Lima, on the coast. At Cuzco, in the sierra, the range is only from 12° CΒ (54° FΒ ) to 9° CΒ (48° FΒ ), while at Iquitos, in theΒ AmazonΒ region, the temperature averages about 32° CΒ (90° FΒ ) all year round. The cold southβnorth Humboldt (or Peruvian) Current cools the ocean breezes,Β producingΒ a seaΒ mistΒ with the inshore winds on the coastal plain. Only during the winter, from May to October, does this sea mist (garΓΊa) condense into aboutΒ 5 cmΒ (2 in) of rain.
The currency of Peru is known as the sol. The sol substituted the Peruvian inti in 1991. The word sol is derived from Latin (solidus) although the word also refers to the sun in the Spanish language. The currency is portioned into 100 parts called centimos (cents). After the currency was introduced in 1991, the currency was commonly known as Nuevo until the Peruvian congress pioneered the renaming of the currency just to sol.
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Attracted by the empireβs legendary wealth the Spanish arrived in Peru in 1531. They gradually conquered the country and imposed their language and religion on the indigenous population. For the next three centuries, the country was dominated by descendants of the conquistadores, with indigenous groups suffering discrimination and political marginalization.
In the 1960s this model reached a critical point when the exhaustion of a number of resources and growing social unrest led to the military coup of General Juan Velasco Alvarado. After taking power in 1969 General Velasco introduced an aggressive land reform scheme in an unsuccessful attempt to implement a state-led development model. Most foreign companies were nationalized.Β
Latitude has less effect on the climate of the sierra than altitude. The rainy season in the Andes extends from October to April, the reverse of the coastal climate. Temperatures vary more from day to night than seasonally. The snow line ranges from 4,700 to 5,800 m (15,500 to 19,000 ft.). In the eastern rainforest, precipitation is heavy, from 190 to 320 cm (75 to 125 in) annually; rain falls almost continuously between October and April.
A warmΒ PacificΒ west-to-east current called El NiΓ±o appears near the Peruvian coast every four to ten years around Christmastime (the name is a reference to the Christ child), occasionally causing serious weather disturbances.