J. Hector St. Jean de Crevecoeur's "Letters from an American Farmer"

posterity

/pɑˈstɛrədi/ (n)
a. As a mass noun: all future generations of people collectively, esp. regarded as the beneficiaries of a particular inheritance, tradition, culture, etc. for (also †in) posterity: for (the sake or good of) future generations; for the future.
OED