If you’d ever actually seen a Star War - which you haven’t - you’d know that TLJ takes place straight after TFA, in which the majority of the New Republics fleet is destroyed in the Hosnian System, along with their political and military leaders. As the New Republic, much like the Republic in the original trilogy, is a fairly loose political entity that didn’t have much of a military to begin with (no one but Leia really saw the New Order as a threat in TFA remember, hence the need for a resistance in the first place) that leaves the First Order as by far the most powerful force in the galaxy. They only lost a jumped up death star; the Republic was effectively destroyed.
Right, this is definitely, absolutely, 100% the last time I’m drawn into this.