Mississippi. It had been in Spanish hands since 1763; but Talleyrand,
Bonaparte's foreign minister, put pressure upon Spain, and Louisiana
became French once more under the secret treaty of San Ildefonso (October
1800). The news of the retrocession, however, aroused intense feeling in
the United States, inasmuch as the establishment of a strong foreign
power at the mouth of the principal water-way in the country jeopardised
the whole trade of the Mississippi valley. President Jefferson,
recognising that the perpetuation of the new situation "would have put us
at war with France immediately," sent James Monroe to Paris to negotiate.
As Bonaparte plainly saw at the beginning of 1803 that another war with
Great Britain was inevitable, he did not wish to embroil himself with the
Americans also, and agreed to sell the possession to the Republic for
eighty million francs. Indeed, he completed arrangements for the sale
even before Monroe arrived.

Some efforts had also been made, at Bonaparte's instance, to induce Spain
to give up the Floridas, East and West, but European complications
prevented the exertion of pressure in this direction; and the whole of
Florida became part of the United States by treaty signed in 1819. The
sale of Louisiana lowered the French flag on the only remaining portion
of American territory that acknowledged the tricolour, except the
pestilential fragment of French Guiana, on the north-east of South
America, where France has had a footing since the beginning of the
seventeenth century, save for a short interval (1809 to 1815) when it was
taken by the British and Portuguese. But the possession has never been a
profitable one, and a contemporary writer, quoting an official
publication, describes it as enjoying "neither agriculture, commerce, nor
industry."* (* Fallot, L'Avenir Colonial de la France (1903) page 237.)

In the West Indies, France had lost Martinique and Guadeloupe during the