After the American Revolution (1775-1800), how was the relationship between the Native Americans and the American People?I have two different...

I think that the seeming contradiction in your two documents is actually very helpful.  That's because the relations between Indians and Americans was not always the same.

In general, the relationship was bad.  It had generally been bad almost from the time the settlers got to North America and it would, for the most part, remain bad.  During the time period you mention you have, for example, the Battle of the Fallen Timbers and you have the British trying more generally to get the Indians to attack Americans.

But it's not that simple because not every tribe was in the same situation.  Some tribes would be trying to use the whites as allies against their own enemies.  After all, the whites were a source of weapons and power.  So I would interpret that first document like that.  I'd say the second one shows how things usually were, but the first showed how things were sometimes when the Indians' and the whites' interests coincided in a limited time and place.