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Why did roosevelt support a “europe first” strategy even though it had been japan that had first attacked the united states?

Which two sets of political ideas speed as a result of the worldwide depression of the 1930s

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