I know that being Thankful is generally good. Gratitude is by all means a virtue, so I won't belabor this too much.
As you go about your Thanksgiving celebrations, be aware of those things that you may have at the expense of someone else.
Thanksgiving is rooted in the feasts celebrated by Puritans to express appreciation for things that they attributed to the Providence of God. This included a bountiful harvest, or a
victory against Catholics in Europe. This of course included the notion that the "New World" was offered to them by the Divine Providence of God.
We've maintained this outlook in our modern celebrations of Thanksgiving. We thank God for our prosperity. We thank God for the things we have (which other people do not).
Don't be thankful about these things. God didn't give us the New World; we took it. God didn't give those of us with privilege privilege; we took it from those weaker than ourselves.
Be somber if you have wealth, because the last will be first and the first will be last. Why be thankful for the thing that makes you less likely to be welcomed into God's kingdom than your weaker sister or brother?
Be Thankful for only one thing this Thanksgiving— be thankful for the gift of God's Son. Because Christ was offered to all of us. Christ was given by the Providence of God. The Eucharistic feast which Catholics and Orthodox celebrate is a table where all are welcome. It is a table where we express our gratitude for the one thing that was offered to all of us: salvation. My salvation is not given me at the expense of someone else. I didn't take my salvation from someone weaker than I. It was given freely to me and all my sisters and brothers.
This Thanksgiving, don't be grateful for America and all of its 'blessings'. Be sorrowful that for the past couple of hundred years we've been prancing around talking about how God has blessed us, when in reality we stole this place and we keep stealing from the weak.
My favorite quote from John Chrysostom:
If you cannot remember everything, instead of everything, I beg you, remember this without fail, that not to share our own wealth with the poor is theft from the poor and deprivation of their means of life; we do not possess our own wealth but theirs.
And here's what I wrote about this last year:
The American Myth: Giving Thanks on Thanksgiving