Hmmm . . .
Well, when the South fired on Fort Sumter, killing no one, Abraham Lincoln blockaded every Southern port, sent Gen. Sherman to burn Atlanta and pillage Georgia and South Carolina, and Gen. Sheridan to ravage the Shenandoah. He locked up editors and shut down legislatures and fought a four-year war of reconquest that killed 620,000 Americans – a few more than have died in Gadhafi's four-week war.
Good thing we didn't have an "international community" back then.
The Royal Navy would have been bombarding Lincoln's America.