Who did the blackfoot tribe trade with?

Ascientist performs an experiment where she measures the mass of a piece of metal, pours acid onto the metal, washes the metal, and then re-measures the mass of the metal. the scientist repeats the experiment several times, each time increasing the amount of acid used. the dependent variable in the experiment is the: initial mass of the metal final mass of the metal amount of acid used washing the metal

What is the impact of enlightenment ideals on the development of economic, political, and religious structures in the western world?

What are three supporting points as to why opium was wrong in the chinese trade? why should it have stopped? (opium wars)