The Border States of the American Civil War (1861)

The Border States were slave states that did not secede from the Union in 1860–61. Their loyalty was contested, and they became critical geographic and political battlegrounds.

The Four Universally Recognized Border States

1. Delaware – Never seriously considered secession; few slaves.
2. Maryland – Secession blocked by federal occupation; critical for DC's security.
3. Kentucky – Declared neutrality; eventually Union-controlled; birthplace of Lincoln.
4. Missouri – Pro-Confederate government fled; brutal guerrilla war; stayed Union.

States Often Included in Broader Definitions

• West Virginia – Seceded from Virginia to join Union (1863); culturally Appalachian.
• Tennessee – Seceded but had strong Unionist east; early Union occupation.
• North Carolina – Seceded reluctantly; significant Unionist sentiment in mountains.

Why They Mattered

• Geography: Control of Ohio & Mississippi Rivers, rail lines, mountain passes.
• Manpower: Supplied ~200,000 soldiers to both sides combined.
• Politics: Lincoln's delicate policies (e.g., Emancipation Proclamation exempted them) aimed to keep them.

Historical consensus centers on four core border states (DE, MD, KY, MO); others are context-dependent.