While Thanksgiving is a national holiday, the tradition of giving thanks at the end of the harvest is a religious event celebrated in most cultures. The national practice of giving thanks in November is therefore quite biblical.
Scripture abounds with thanksgiving to God, for thanksgiving is part of the Christian way of life, no matter what the circumstances. These are just a few scriptures you may wish to use for a Thanksgiving liturgy.
For a church service Col. 1 is particularly appropriate, bridging the liturgy between Christ the King Sunday and the First Sunday in Advent. In lean years, other scriptures, such as that of Habakkuk may be more appropriate.