In Batman Beyond the animated series....?

theres an episode named The Call where Superman comes in to recruit the new Batman for his new Justice League.....I just want to know what happend to the original Justice League??? Like Flash, Green Lantern, Wonderwoman, Did they die or what all happend. Just currious because I've been watching the Batman, Justice League, and Batman Beyond series and I haven't seen an explination yet. If theres an episode that you know about plz let me kno what it is. and if there isn't an answer for what happend let me know what you think happend. Thanks!