Manslaughter involves a Non-Premeditated Intent to kill. Involuntary Manslaughter would be a Non-Premeditated, Accidental "Murder."
Murder itself is having the Intent to kill, and Planning to do so.
Answer:
No, American settlers did not adhere to the Northwest Ordinance of 1787. The Northwest Ordinance guaranteed tribal land rights, but settlers would kick American Indians off of the land they planned to settle.
The answer is encomiendas