Why can't an emitter go past 200 frames I want to make a cover for a preview of my first animation, so in he middle of my animation video, I put all the models in the main set to make a cover for the video, and grabbed one of the cameras.

However when I render it, it just shows the render of the last frame I did on the animation. Its like Blender doesn't want to shoot the cover and just wants to get back to the animation.
If I understand your question correctly:
By default, in your particle system the particles emit from frame 1 to frame 200. 
Try to increase the "End" value.