At this session the first law in relation to the slave trade was passed. It was to prevent the importation of negroes, mulattoes and other persons of color into any port of the United States within a state which had prohibited by law the admission of any such person. The penalty was one thousand dollars and the forfeiture of the vessel. The slave trade was not then prohibited by the constitution, nor was the subject then generally agitated, though it had been as early as 1793, when, as previously stated, an exciting sectional debate followed the presentation of a petition from Pennsylvania to abolish the slave trade. Probably the most important occurrence under the first administration of Jefferson was that relating to the purchase and admission of Louisiana. There had been apprehensions of a war with Spain, and with a view to be ready Congress had passed an act authorizing the President to call upon the executives of such of the states as he might deem expedient, for detachments of militia not exceeding eighty thousand, or to accept the services of volunteers for a term of twelve months. The disagreement arose over the southwestern boundary line and the right of navigating the Mississippi. Our government learned in the spring of 1802, that Spain had by a secret treaty made in October, 1800, actually ceded Louisiana to France. Our government had in 1795 made a treaty with Spain which gave us the right of deposit at New Orleans for three years, but in October, 1802, the Spanish authorities gave notice by proclamation that this right was withdrawn. Excitement followed all along the valley of the Mississippi, and it was increased by the belief that the withdrawal of the privilege was made at the suggestion of France, though Spain still retained the territory, as the formalities of ceding it had not been gone through with. Jefferson promptly took the ground that if France took possession of New Orleans, the United States would immediately become allies of England, but suggested to Minister Livingston at Paris that France might be induced to cede the island of New Orleans and the Floridas to the United States. It was his belief, though a mistaken one, that France had also acquired the Floridas. Louisiana then comprised much of the territory west of the Mississippi and south of the Missouri.