What european nation first established settler colonies in the americas?

Why do countries create guidelines and laws on how a country is going to be run?

What was the result of delegates from the democratic party not being able to nominate a candidate in 1860

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