What did France want to start in Mexico?

The Second French Intervention in Mexico (Spanish: Segunda intervención Francesa en México, 1861–1867; known as Expédition du Mexique in France at the time and today as Intervention française au Mexique), also known as the Second Franco-Mexican War and Mexican Adventure, was an invasion of Mexico, launched in late 1861, by the Second French Empire (1852–1870), aiming to establish in Mexico a regime favorable to French interests. On 31 October 1861, France, the United Kingdom, and Spain agreed to the Convention of London, a joint effort to ensure that debt repayments from Mexico would be forthcoming. On 8 December 1861, the three navies disembarked their troops at the port city of Veracruz, on the Gulf of Mexico. When the British and the Spanish discovered that France had an ulterior motive and unilaterally planned to seize Mexico, they peacefully negotiated an agreement with Mexico to settle the debt issues. Simultaneously, Britain and Spain withdrew from the military coalition agreed to in London, and recalled their forces from Mexico. The subsequent French invasion took Mexico City and created the Second Mexican Empire (1861–1867), a client state of the French Empire. Many nations proceeded to acknowledge the political legitimacy of the newly created nation state. In Mexican politics, the French intervention allowed active political reaction against the liberal policies of social and socio-economic reform of president Benito Juárez (1858–1872), thus the Mexican Catholic Church, upper-class conservatives, much of the Mexican nobility, and some Native American communities welcomed and collaborated with the French empire's installation of Maximilian von Habsburg as Emperor of Mexico. In European politics, the French intervention in Mexico reconciled the Second French Empire and the Austrian Empire, whom the French had defeated in the Franco-Austrian War of 1859. French imperial expansion into Mexico counterbalanced the geopolitical power of the Protestant Christian United States

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