He reappeared for a few months after General Pavia's coup d'Nat in January 1874, to join a coalition cabinet formed by Marshal Serrano, with Sagasta and Ulloa.
After the coup d'Nat of Don Leopold O'Donnell in 1856, Sagasta had to go into exile in France, but promptly returned, to become the manager of the Progressist paper La Iberia, and to sit in the Cortes from 1859 to 1863.
In this capacity he made a sensation by his L'Etat de la France a la fin de l'an VIII (1800), which he had been commissioned by Bonaparte to draw up, as a manifesto to foreign nations, after the coup d'Nat of the 18th Brumaire.
The proclamation of a republic in the provinces of Pernambuco and Ceara, with the rebellion of the Cisplatina province, favoured by Buenos Aires and its ultimate loss to Brazil, were the result of the coup d'Nat of November 1823.
The coup d'Nat of the 9th of July 1762 properly belongs to the history of Catherine II..
After the coup d'Nat of 1851 he became a senator and inspector-general of superior instruction, sat upon the commission for the reform of the Ecole Polytechnique (1854), and, on the 30th of January 1854, succeeded Arago as director of the Paris observatory.