By 1550 the civil wars were over, the unruly original conquistadores had been executed, banished, or reduced to obedience. Shortly afterward the system of Indian tribute and slavery was modified so that although the proprietors got rich the aborigines were saved from rapid extermination, royal officials and functionaries were installed, an elaborate system of taxation established, and Ecuador, with the rest of Spanish America, entered upon a long period of exploitation under form of law, instead of being the haphazard prey of irresponsible private adventurers. [Illustration: ECUADOR INDIANS.] For the next two hundred and fifty years Ecuador has no history. The occasional eruption of a volcano or an Indian insurrection is all one finds in the annals, except the interminable lists of the Spanish officials sent out to enrich themselves and the Crown at the expense of the hapless Indians. The Spanish occupation brought about no colonisation of Ecuador in the true sense of that word, although it worked a considerable revolution in the life and customs of the Indians who continued to constitute the bulk of the population. Indeed, the habitable area of the Andean plateau was so limited and the aboriginal population so numerous, that there was no room for immigration without a war of extermination. The cultivable area of Andean Ecuador barely exceeds eight thousand square miles, and it is probable that more than a million natives lived there in the time of the Caras and Incas. Even at the present day these eight thousand miles contain more than two-thirds of the total population, and not more than four hundred thousand people inhabit the two hundred and eighty thousand square miles of high, barren mountains, steep declivities of the Cordillera, and wooded plains on the coast and in the Amazon valley, which constitute the remainder of Ecuador. One of the important results of the Spanish occupation was the introduction of new food plants and domestic animals. Wheat and barley were early planted by the Castilian proprietors who had divided the country among themselves, and these grains quickly replaced the quinoa, which, with the potato, had been the chief reliance of the Caras. The cultivation of the potato and also of maize was, however, continued. The Spanish invaders introduced the plantain and banana, which immediately became the staples of the forested and tropical districts, making possible a great increase of population. The plateau was found suited to European fruits, and orchards were soon flourishing in its more favoured parts. Rice, indigo, and sugar-cane were also introduced, and an export trade in these articles grew up, as well as in the native cacao and sarsaparilla.