In 1882, Congress passed the first federal law to restrict the immigration of free people based on race and class. The immigrants this legislation targeted were from

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

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the allies' desire to seek retribution for germany's actions