The event in the 1700s that advanced human services in the united states occurred when congress established a federal chain of hospitals for the relief of   single mothers and their children war veterans disabled and sick seamen mentally challenged children and adults

The correct option here is the third one.

In 1789, the Congress passed An Act for the relief of sick and disabled seamen which in order to create additional hospitals for the seamen and to provide further medical care decided to deduce 20 cents from the seamen wages. This act marked the advancement of the human services in the United States as it allowed numerous seamen to get the treatment they required.

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