NATIVE AMARICAN STUFF CROSSWORD WHAT IS IT ???????

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Across
  1. 3. flat_land
  2. 5. was_always_there
  3. 7. a_person_that_lives_in_america
  4. 8. p,o,t,t,?,r,y
Down
  1. 1. a_water_animal_that_is_super_common
  2. 2. also_called_buffalo
  3. 4. the_land_and_stuff_around_you
  4. 6. artic_native_amaricans