[Thom Pain]

Just exactly how many slaves did the U.S. Government own?

That's right - NONE.

The descendents of slaves (btw - who were sold into slavery by their own tribes and relatives) who are unhappy here should go visit their cousins in their homelands for a few months. Then we'll talk.

[lepton]

Just exactly how many slaves did the U.S. Government own?

That depends on how you define "U.S. Government." Some military units had slaves which were associated with the posts, not with individual owners.