Which was a major cause for the entry of the U. S. into World War 1?

The assassination of Archduke Franz Ferdinand of Austria-Hungary.

Explanation:

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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