Currently, the pvp assault regions on nations (America and Scandinavia) have an attack window of 17:00-18:00 UTC. On the weekend attack windows, this isn't as much of a problem for NA players. However, during the weekdays, it becomes nearly impossible to attend. To put into perspective, 18:00 UTC can be from 10am (rip west coast) to 1pm at best, depending on where you live. Most players have school/work to attend and this makes it nearly impossible to attend a pvp region during the weekdays. It's not much better for NA players on the weekend (who wants to wake up at 9am on a Saturday for minecraft?), but at least it's more possible to attend than during the week.
I believe that the solution, in order to create a more balanced opportunity for NA players to participate in pvp assault regions, is to move the attack window back by a few hours. I suggest that the window during weekdays be changed to at least 20:00-21:00 UTC. Perhaps America region could be 21:00-22:00 UTC and Scandinavia can be 20:00-21:00. Either way, a change is very much needed in order for NA players to even be able to come.
Additionally, a 1-2hr push to the weekend attack windows would be nice, though not as urgently needed as the aforementioned suggestion.