Here's the historical significance, the etymological origins, geographical and Halloween's devotional
What are the historical origin of Halloween? We are right when we say
that this is a party that doesn't concern us? The history of this
ancient celebration has its origins in Europe, the founders of this
Festival are the Celts, with migratory flows at a time the United States
of those who are romantically called Pilgrim Fathers recurrence has
simply moved to the new lands occupied by Europeans, mainly Anglo-Saxons
who have simply transferred to their new address their own customs and
traditions. Thus dispelling the first myth: Halloween is was born in the
old continent.
In Irish the Hallow e'en form is nothing more than a contraction of
All Hallows ' Eve, which is the eve of all Saints ' day. In addition,
for the Celts, the new year began on November 1, Halloween was the
Celtic new year marking the arrival of winter and a real social
withdrawal and work. The Celts lived mainly by farming, animals with the
arrival of the cold season were reported downstream and conducted heat,
men closing in home building and drawing tools set aside provisions
during the warm months. It was an important rite of passage, we
delivered to the forces of nature, they surrendered us hoping for
kindness.
The Celts believed that on the night of October 31 the spirits of the
dead, who lived in a plain of eternal youth and happiness called Tir
nan Oge, they wandered undisturbed trying a body which seize back to
life. The living, to save their souls, had to scare the spirits through
masks and scary. The fires were lit and animals sacrificed in order to
appease the spirits; food, milk and basic necessities were left to each
home inputs in order to feed the dead, evaded their needs would have
perhaps saved the souls of the living.
Source : http://goo.gl/tO8kZA