The act of kidnapping American sailors was called ?

shanghaiing

Explanation:

Shanghaiing or crimping is the practice of kidnapping people to serve as sailors by coercive techniques such as trickery, intimidation, or violence. Those engaged in this form of kidnapping were known as crimps. ... Under this act, a sailor had to sign on to a ship in the presence of a federal shipping commissioner

increased food supply

improved public health

increased birth rates

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