When the united states joined the allies, why did the allies concentrate first on defeating hitler?

answer; ///i do believe that the correct answer is (d); ///athens had a small population;

aug 15, 2012 - although van leeuwenhoek was not the inventor of the microscope, he advanced it more he loved to grind and focus a new lens in order to see the unseen world. most of leeuwenhoek's microscopes were silver. in a simple but significant experiment (1668), he demonstrated that worms found on