The first peoples who had arrived at the American continent had been the natives of the North America during the Pleistocene, in migrations of Siberia for the Alasca, possibly through the formation of a terrestrial bridge in the Strait of Bering. They were nomadic inhabitants and they had spread themselves all for the continent. These peoples had formed societies organized with customs and religions, having formed great civilizations. The civilization of a people occurs through the influence of natural resources, the climate, the interchange with other civilizations, the necessity to accumulate wealth, knowledge and even though to exert the military domain in definitive region. These factors contribute for evolution and the partner-cultural transformation of each civilization Some vestiges, as runa of Kensington in century X, leads to believe that vikings had been the first European explorers who had arrived in Americas. Pparently they had not colonized America, they had limited to establish it contacts and they had stimulated the commerce of skins of animals and other merchandises. With the arrival of the Spaniard, Portuguese, English and Frenchmen, eager for wealth and domnios for its kingdoms, had been verwhelming entire populations, and of what she happened with fond of navigators in the continents Asian and African, had in contrast intimidated the remainders and had compelled the future generations to absorb its culture, stanching the natural evolution of interchange of the American civilizations.
The American peoples surely Know that when of the arrival of the Europeans, some civilizations, as the Azteca and the Inca were great established empires, also dominating other peoples. They spoke around 2.000 languages in isolated villages, or the centers of great empires, with bigger cities that Lisbon and Madrid. In the capital of the Empire Azteca, Tenochtitln, that occupied a 13mil area km2, possibly 200 a thousand inhabitants only lived more than, being that at this time only four European cities possuam 100 a thousand inhabitants more than, and Seville, the biggest Spanish city possua less than 45 a thousand people.