Angola is a tropical country, but much less warm and humid than for instance the Democratic Republic of Congo, which is to the north of Angola. It used to be a Portuguese colony, but the people revolted and in 1975 the Portuguese left. But a time of wars broke out which lasted no less than 42 years. Only in 2002 peace came, but the country was in ruins. More than 1 million people died, 4.3 million internal refugees, 400 million refugees in the Congo and Zambia, countless were malnourished and education has not developed in most of the years of war. Railways, bridges and roads have been totally destroyed. The country was full of mines that had been laid in a 30-year period.