In the first few decades of the 20th century, several volunteer organizations were founded, including the Rotary International, Kiwanis International, Association of Junior Leagues International, and Lions Clubs International.
V prvých dekádach 20. storočia bolo založených množstvo dobrovoľníckych organizácií, napríklad Rotary International, Kiwanis International, Association of Junior Leagues International a Lions Clubs International.