What factor contributed to chicago's rise as a steel-making and manufacturing center in the late 1800s?

What caused the comanche kiowa raiding? a. gadsden purchase b. battle of alamo c. bear flag revolt d. settlement of texas

Which group was responsible for determining the borders of african colonies and later countries

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