Finally the Spanish colonies in America constituted another source of danger. Jefferson was confident that Spain would never be in a position to conduct a war of aggression against the United States; but being a weak country and embroiled in European affairs, her colonies might be used at any time as mere pawns in the unscrupulous game of European politics. In these circumstances the attitude the United States should observe in their relations with the Spanish colonies was to be seriously considered. A curious illustration of the fears and schemes which passed at that time through Jefferson's mind is found in an episode of his Southern journey during the preceding year. The gist of his conversation with a Brazilian he met at Montpellier was that an important group of colonists were ready to follow the example of the United States and proclaim their independence of the mother country. But as Portugal was certain to join forces with Spain in repressing such a revolution, the Brazilian patriots had decided not to undertake anything before securing the assistance of some other country. The thinking part of the population had naturally thought of the United States. "They would want cannons, ammunition, ships, sailors, soldiers and officers, for which they are disposed to look to the United States, it being always understood that every service and furniture will be well paid." The answer of Jefferson to that alluring proposition, contains more than one interesting point:
I took care to impress on him, through the whole of our conversation, that I had neither instructions nor authority to say a word to anybody on this subject, and that I could only give him my own ideas, as a single individual; which were, that we were not in a condition at present to meddle nationally in any war; that we wished particularly to cultivate the friendship of Portugal, with whom we have an advantageous commerce. That yet a successful revolution in Brazil could not be uninteresting to us. That prospects of lucre might possibly draw numbers of individuals to their aid, and purer motives our officers, among whom are many excellent. That our citizens being free to leave their own country individually, without the consent of their governments, are equally free to go to any other.[177]