Some estimates indicate that the number of inhabitants in Brazil before the arrival of the Portuguese would be 3 to 4 million people. The clash of civilizations has led to a sharp decline in the indigenous population, and today and its number are only 280000 people. There were hundreds of different tribes, but they could be divided into four linguistic groups. Some of these tribes have been completely extinct, and others are on the verge of extinction. According to the most accepted theory, the Brazilian natives would have arrived in the territory that today is Brazil 48 thousand years ago and originated in migrations from Asia through the Strait of Bering. The Brazilian tribes that had the first contact with the Europeans were those who lived in the coastal zone. The tribes of Amazonia only had contact with the first whites about 100 or 200 years after the discovery of Brazil. Some of the most relevant and populous Brazilian tribes are the Guarani, the Yanomami, and the Tikuna.