In 1810, he became corporation counsellor of the municipality of Santiago. The year 1810 was very complicated politically for the Spanish empire in general, and for Chile in particular. Two years before the King Ferdinand VII had been imprisoned in France. In Chile, the Royal Governor Francisco Antonio García Carrasco had been forced to resign due to his ineptitude and corruption, and had been replaced by Mateo de Toro y Zambrano. Infante's intellectual reputation helped him contribute to the formation of the first independent junta that could help reshape the political arena. So, after Mateo de Toro y Zambrano took over as Royal Governor, he was convinced to call an open meeting of the leading citizens of the city to decide the political future of the colony. He convened such a meeting for the morning of September 18, 1810. The discussion ended with the conformation of the Government Junta of the Kingdom of Chile, where he was a very active member of the assembly.