From Italy, he came to the United States, where he visited Boston, New York, Philadelphia and other towns, sailing from Charleston for Venezuela. He arrived in Caracas at the end of 1806. Upon his return home, Bolívar devoted himself to the care and improvement of his estate. Yet his ideas continued to seethe, especially when the constant spectacle of the state of affairs in Venezuela stimulated this ferment of his mind. Among the American colonies, Venezuela was not considered by Spain as one of the most important. Mexico and Perú, celebrated by their production of mineral wealth, were those which attracted most of the attention of the Spaniards. Venezuela was apparently poor, and certainly did not contribute many remittances of gold and silver to the mother country. It had been organized as a captaincy general in 1731, after having been governed in different ways and having had very little communication with Spain. It is said that from 1706 to 1722, not a single boat sailed from any Venezuelan port for Spain. Commercial intercourse between the provinces was forbidden, and local industries could not prosper because the purchase of the products of Spanish industries was compulsory for the natives, at prices set after all transportation expenses and high taxes were taken into account. The colonists were oppressed by taxes and kept in ignorance. This state of affairs had produced a latent feeling of irritation and a desire for a change. The native white population read the books of the French philosophers, especially those of Rousseau and Montesquieu. The ideas proclaimed by the United States of America and those preached by the most radical men of the French Revolution were smuggled in and known in spite of prohibition. At the middle of the eighteenth century, there had been a movement against the Compañía Guipuzcoana, established about 1730, and which greatly oppressed the people. This movement failed and its leaders were severely punished. At the end of the eighteenth century, Spain allied herself with England to fight against France. This war ended in 1795 with the Treaty of Basel, by which Spain lost Santo Domingo to France. A year later, Spain allied herself with France against England, and the disastrous war which followed resulted in the loss of the island of Trinidad to England, by the Treaty of Amiens, in 1802. France and England used these possessions to foster revolutions in the Spanish colonies. In 1797 a conspiracy was started in Caracas, but it too failed. Some of its leaders received death sentences, others were expelled from the country and others were imprisoned. In Mexico, in Perú and in the southernmost part of the continent, men were working in favor of the idea of freedom.