Updated October 25, 2016. Definition: A budget deficit is when spending is greater than the revenue received for that year. That's known as deficit spending. The national debt is the accumulation of each year's deficit. When revenue exceeds spending, that creates a budget surplus.
Quick Answer. Mexico gained independence from Spain on Sept. 27, 1821. On Sept. 16, 1810, Miguel Hidalgo y Costilla declared independence from Spain by issuing the Grito de Dolores and launched the Mexican War of Independence. The war ended with the signing of the Treaty of Cordoba on Aug. 24, 1821.
In 1521, the Spanish Empire conquered and colonized the territory from its base in Mexico-Tenochtitlan, which was administered as the viceroyalty of New Spain. Three centuries later, this territory became Mexico following recognition in 1821 after the colony's Mexican War of Independence. The tumultuous post-independence period was characterized by economic instability and many political changes.