Outside the Treaty of Aranjuez, Spain also secretly agreed to retrocede the Louisiana territory (over 2 million square kilometers) back to France in order to secure the Kingdom of Etruria as a client state for Spain; Louisiana was first ceded by France to Spain in 1763 at the end of the Seven Years' War. Louisiana was duly transferred to France on 15 October 1802, after the signing of the Treaty of Aranjuez. Napoleon subsequently sold Louisiana in the Louisiana Purchase on December 20, 1803, in order pay for his French armies during the War of the Third Coalition.
The first king (Louis I) died young in 1803, and his underage son Charles Louis succeeded him. His mother, Maria Luisa of Spain, was appointed regent. However, since Etruria was troubled with smuggling and espionage Napoleon annexed the territory, thus becoming the last non-Bonaparte Italian kingdom on the Peninsula. Since Spain's only hope of compensation lay in Portugal, co-operation with the emperor became more important.
In 1807, Napoleon dissolved the kingdom and integrated it into France, turning it into three French départements: Arno, Méditerranée and Ombrone. The king and his mother were promised the throne of a new Kingdom of Northern Lusitania (in northern Portugal), but this plan was never realized due to the break between Napoleon and the Spanish Bourbons in 1808. After his downfall in 1814, Tuscany was restored to its Habsburg Grand Dukes. In 1815, the Duchy of Lucca was carved out of Tuscany as compensation for the Bourbons of Parma until they resumed their rule in 1847.