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The action primarily associated with the Civil War is the abolition of slavery. The Civil War (1861-1865) was fundamentally fought over the issue of slavery and its expansion into the territories of the United States. The Southern states sought to maintain and expand their agricultural economy reliant on slave labor, while the Northern states were increasingly opposed to the institution of slavery.

The culmination of this conflict led to the Emancipation Proclamation in 1863, issued by President Abraham Lincoln, which declared that all slaves in the Confederate states were to be set free. This act not only redefined the purpose of the war but also set the stage for the eventual passage of the 13th Amendment in 1865, which formally abolished slavery across the entire country.

While the other options have historical significance, they are not primarily associated with the Civil War's immediate causes or consequences. Women's suffrage gained momentum post-Civil War with the passage of the 15th Amendment, economic recovery became a concern during the Reconstruction era that followed the war, and westward expansion was more closely tied to the periods before and after the Civil War. Therefore, the abolition of slavery is the most pertinent action directly linked to the events and outcomes of the Civil War.