The Senate begins to quiet down, a booming voice comes over the loud speaker. It is the Supreme Chancellor.
Chancellor: The Sith powers grow, we can all agree. We must make a decision now. All in favor of the Mobiliazation of forces against the Sith in formal war declaration?
The Senate chambers is filled with several voices all agreeing.
Chancellor: Then it is settled. As of now, we are at formal war with the Sith.
A Message is sent to the Generals of the Republic army to mobilize and begin production of arms.
OOC: Me, Dante, and Awec did a whole argument with the Senators. It's about time formal declaration of war has been made. If you wish to argue, lets think of what it would be like if this did not happen?
Senator: Oh, well the attack on Correllia was a mistake. Let's not declare war and allow the Sith to kick our @$$e$
There you have it, my reasoning.