Green October

October 12, 1976, otherwise known as Green October was the day in which the Pigs surrenderred to the Birds, and Piggania officially became an independent nation.

Etymology
The name refers to green, a color. The color usually stands for optimism and pigs. Optimism because the war has ended, and an age of growth has begun. The pigs being referenced because they were taken down, and their green color was on independence posters all over the country. Independence happen in the month of October, thus Green October.