Napoleon's invasion of Spain constitutes at once the most contemptible and the most disastrous chapter in his career. In 1807, under the terms of an agreement with Godoy, the unworthy favorite of the queen and the virtual ruler of Spain, a French army was introduced into the kingdom for the nominal purpose of punishing Portugal for her refusal to join the continental system. The Portuguese royal family, fully appreciating the danger in which they stood, fled to America and founded the empire of Brazil, which in 1815 was declared independent of Portugal. The Spanish rulers attempted to follow their example, but their intended flight became known and they were prevented by the populace from leaving the capital. In the meantime a disgraceful quarrel having arisen between the old king, Charles IV, and Prince Ferdinand, Napoleon, whose troops were now firmly established in Spain, stepped in as arbiter between father and son and summoned them both to meet him on the northern frontier. Having purposely lingered in France beyond the appointed time, he succeeded in enticing them over the border to Bayonne, where he compelled both to renounce forever the crown of Spain and the Indies, which he forthwith bestowed upon his brother Joseph. When the truth dawned upon them, the Spanish nation rose to a man. Napoleon had unwittingly aroused the latent principle of nationality; he had put into action a force which was new and one which the statesmen of Europe had hitherto left out of account, but which was to prove the most potent factor in the new epoch of political history introduced by the French Revolution. Provisional juntas were rapidly organized in the various provinces of the kingdom of Spain and affairs administered in the name of Ferdinand VII. The Junta, or as it is better known, the Regency of Cadiz, rapidly gained a position of national importance and became the chief executive body of the Spanish nation. The American provinces, which had long been restive under Spanish rule, now claimed the same right of self-government that the provinces of the Peninsula had assumed, and began to depose the Spanish governors and to set up juntas of their own, still acting in the name of Ferdinand VII. The Americans claimed that they were not politically a part of Spain, but connected only through the sovereign, and that with the removal of the sovereign the connection ceased. The Regency of Cadiz, on the other hand, maintained that the colonies were integral parts of Spain, and claimed, therefore, the right to govern them in the absence of the sovereign.