The history of "Trick'O'Treating" can be traced back to the early celebrations of All Soul's Day in Britain. The poor would go begging and the housewives would give them special treats called "soulcakes". This was called "going a-souling", and the "soulers" would promise to say a prayer for the dead.
Over time the custom changed and the town's children became the beggars. As they went from house to house they would be given apples, buns, and money.
During the Pioneer days of the American West, the housewives would give the children candy to keep from being tricked. The children would shout "Trick or Treat!".