Originally Posted by Yagami Crewman
Unfortunately in American history, that sort of behavior was NOT at all uncommon in the 19th century US expansion. All the Indian wars, the Mexican war, and nearly a war with Great Britain over the Oregon territory occurred for exactly such reasons. Again it would be a major reason why Klingons (Like Kor: "You've hemmed us in! Strangled our trade! Cut off vital supplies! You've been asking for war!) would be antagonistic to the Federation at this time.
I always thought that the Federation is based on voluntary membership instead of expansionism. Perhaps the Federation grew faster in the border regions than the Klingon Empire and that's why they were so annoyed?