antibellum

The state of being at war or being engaged in a warlike conflict.

Belligerence.

A hostile or warlike attitude, nature, or inclination; belligerency

Colombia wasn't involved until after Germany attacked Pearl Habor. Soon after, they declared a "state of belligerency" against Germany and the German ambassador left.

No war started at Fort Necessity. The Battle of Fort Necessity was an early engagement in what Americans call the French and Indian War and others call the Seven Years War. George Washington eventually surrendered the Fort to French forces, and in the process he signed a surrender document that the French used as one pretext for their continued belligerency.

It refers to a process by which the values and principles of the system in place are contradicted or reversed.

Subversion is used as a tool to achieve political goals because it generally carries less risk, cost, and difficulty as opposed to open belligerency (rebellion or actual fighting).

Satire is one of the most potent forms of subversion for artists and comics, and it can take shape in films, television, books, and even political protest.