Which festival is celebrated on 15 September

Independence Day
Independence Day (Día de la Independencia) is a Mexican holiday to celebrate the “cry of independence” on September 16, 1810

France played a key role in the american revolutionary war (american war of independence; 1775–1783). motivated by the ideals of the new nation which were inspired by the french enlightenment, as well as its long-term rivalry with britain and so as to avenge their territorial losses during the french and indian war, france secretly began sending supplies to the americans in 1775.