How does history affect current pieces of writing or does it only affect literature from the same period

Western sahara is occupied by whom? a. mauritania b. algeria c. morocco d. tunisia

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 one way that the congress of vienna changed the map of europe?