"Hallowe'en Greetings, Let nothing but happiness come between, You and the pleasures of Hallowe'en," circa 1930

A distinctly American blend of Halloween traditions emerged by the late 1800s. Into the 20th century, the holiday became a national celebration of mystery and innocent fun. Often, friends and neighbors exchanged seasonal greeting cards. This colorful example features a jack-o-lantern -- a unique combination of immigrant customs and native harvest crops that embodies the American Halloween.