How did most Africans become enslaved?

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

As american population grew between 1820 and 1850, the percentage of americans living on farms also grew. a. true b. false

Me with these dbq articles 1. whether its reliable? why or why not? 2. what's the main idea 3. demonstrating new deal as success or failure?