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At length, after the Spanish annexation of Portugal in 1580, the government gradually reverted to monopoly grants, now however in the definite form of asientos, in which by intent at least the authorities made the public interest, with combined regard to the revenue and a guaranteed labor supply, the primary consideration.
In so far it approached the asientos of the full type which became the regular recourse of the Spanish government in the following centuries; but it fell short of the ultimate plan by failing to bind the grantees to the performance of their undertaking and by failing to specify the grades and the proportion of the sexes among the slaves to be delivered.