DrDre said:
And while the head has been cut off from the Republic, the First Order has not conquered the galaxy. They are trying to conquer the galaxy which is a much different thing. The galaxy free of the Empire still stands. A few worlds might have fallen under First Order control in the days since the Republic capitol and fleet were destroyed, but he question of whether they are the only ships capable of defense and if any of the planets being attacked can repel the attack remains to be seen. And in a vast galaxy, there is no way the First Order can have conquered everything in the days that have passed in the story.
I copy NeverarGreat’s response:
“The FIRST ORDER reigns. Having decimated the peaceful Republic, Supreme Leader Snoke now deploys his merciless legions to seize military control of the galaxy.”
Reign:
a : royal authority : sovereignty
b : the dominion, sway, or influence of one resembling a monarch
Furthermore it is stated in TLJ, that the FO will control all the major systems in weeks.