The history of Costa Rica forms the only exception among these republics oscillating between tyranny and demagogy. In this country were no clearly divided social castes, no great capitalists, and no crowds of proletariats. A small homogeneous State, in which men were always known as _hermanicos_ ("brotherlies") because their interests and their ideas were identical, Costa Rica seemed to justify the classic idea which associated the success of the republican system with limited territories and small human groups. Work, unity, and lasting peace have been the characteristics of social evolution in {226} Costa Rica. While neighbouring States were at war this tiny republic was progressing peacefully. Salvador also developed normally without the discords of Nicaragua or Guatemala. Race explains the differences to be observed in these great theatres of political experience; in Salvador and Costa Rica the Spanish element was predominant, the castes were confounded, the population was dense, and the birth-rate high. In Honduras mulattos abounded, and in Nicaragua and Guatemala the races were mixed, and the Indians were superior in point of numbers. Among these five tropical republics those which progressed were those in which the race was homogeneous, or in which the Iberian conquerors outnumbered the Indians, negroes, and mulattos. The very tropical anarchy which has turned Central America into a perpetual theatre of civil wars has also continually divided the two zones of the ancient Hispaniola: San Domingo and Hayti. In the one the Spaniards ruled, in the other the French, and the antagonism of these two Powers was of long duration. Hayti is a negro State, and San Domingo refused to submit to the tyranny of ex-slaves. Conflicts of a political origin were supplemented by the warfare of castes. Caudillos and tyrants have succeeded one another in the government; revolutions and domestic wars have continually troubled these two small States, over which the United States have gradually extended their tutelage.