Fait général: 1870 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 1870 is the product of two consecutive Fibonacci numbers.
Culture générale: 1870 is a boring number.
Date historique: February 12th is the day in 1825 that the Creek cede the last of their lands in Georgia to the United States government by the Treaty of Indian Springs, and migrate west.