The filibusters thought they were Manifest Destiny, so why did their own government prosecute them, and why did Southern juries keep letting them go? The episode traces the Ostend Manifesto, Neutrality Act prosecutions that almost never convicted, and the North-South split that came to see filibustering as a Slave Power conspiracy. It ends with William Walker's capture and execution by firing squad at Trujillo, Honduras, in 1860.
The core debate is whether the government genuinely upheld neutrality law or whether enforcement tracked sectional interest so closely that principle was just the language of a sectional quarrel. Both readings have evidence.



