Even today, the U. S.A continues to not be threatened by foreign powers. Why is that?

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

19th amendment granted women the right to vote. the 19th amendment guarantees all american women the right to vote.