free soil
noun
a region, especially a U.S. territory, prohibiting slavery prior to the Civil War.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
It was not many weeks before it became entirely manifest that the cause of slavery had lost immensely by the decision, and the cause of free-soilism had gained in the same degree.
From The Middle Period 1817-1858 by John William Burgess