Guiteras in his "Historia de la Isla de Cuba" has set forth the position of Spain at this time and her relation to France, which led to the famous alliance known as the Family Pact. He says justly, that the general interests of the nation demanded from Carlos III. the continuation of the strict neutrality which his brother had pursued in this war; for by that neutrality the commerce and general welfare of Spain had derived great benefits. But personal motives of resentment against England and of esteem and gratitude for Louis XV. predominated in his mind against the serious reasons of state and the advantages to his subjects, and the voluminous correspondence carried on between him and the king of France made him deeply share the humiliation of the principal branch of his family under the triumph of British arms. These sentiments and other motives finally gave birth to the treaty which was concluded between the two sovereigns on the fifteenth of August, 1761, and which was a defensive and offensive alliance of the two countries with the object of creating between them firm and lasting bonds for the mutual protection of their interests, and thus to secure on a solid basis the internal prosperity of the two kingdoms and the predominance of the house of Bourbon among the princes of Europe. It was agreed to consider henceforth as a common enemy any government that would declare war against either of the two kingdoms and reciprocally to guarantee the dominions they possessed at the conclusion of the war, in which France saw herself involved; to lend each other aid at sea and on land, and not to listen to or enter into any settlement with the enemies of both crowns unless so done with common accord. For as much in peace as in war they had to consider the identified interests of the two nations, compensate their losses and divide their respective acquisitions and operate as though the two peoples were one, by granting to the subjects of both kingdoms in their European dominions the enjoyment of the same privileges as those of their native subjects; and, finally, to admit to participation in this treaty only such countries as were ruled by sovereigns of the House of Bourbon.