On this day in 1776, the Continental Congress approved the Declaration of Independence, marking America’s transformation from a land of 13 foreign-controlled colonies to the sovereign nation it is today. In the 230 years that have passed since then, Independence Day has grown into one of the country’s most widely celebrated holidays. And just how big is Independence Day? The United States Census Bureau reports some pretty impressive numbers.

2.5 million – In July 1776, the number of people living in the 13 original colonies.