I fully support a split whenever it is possible imo, there are two servers anyway. If not for the current version then when the new Strategus arrives.
The problem is that, 6 am for us is 'perfect' evening for the Americans, but 6am for them is ~5pm for us = work/dinner time. Top of that, the lag, which is bad for both sides
Postulating that global recruitment would fix that is false and not the norm either, for a good reason.
We could talk about allowing NA to use the EU map and vice versa, but I would personally be in favor of only regulating people to their native region, or at least only allow your character to participate in one region at a time, but that would still mean people could use the huge time differences to their advantage, which again leaves one region with a vast upperhand. Night attacks are lame, they're even more lame when it's not even a 'night' attack for the attackers
It should be on a 'list of TO DO' somewhere for the developers.