Answer:
Democrats and Republicans
Tries and confirms the charge.
Strong leadership from king henry
I believe the answer is: Formal region
Each formal region would be differentiated by their own unique government structure that separate each region with the other. Each border on the sides of each region would consist of some sort of boundaries ( could be natural or human made) that accepted by all regions as a legal separation between their jurisdiction.
Third parties generally serve only to take votes from one of the main parties. Third parties generally serve only to take votes from one of the main parties. If the third party has a candidate promising similar things to the Rep. candidate, the Democrats are more likely to win simply because their votes are not being siphoned off. Think of it this way: if a school class were to vote on favorite colors and there were only blue and red to choose from, it would probably be mostly equal. But if the same class were to vote for blue, teal, and red, I would be willing to bet that red would win just because its votes weren't being split like the blue votes were. Teal is the third party. It won't ever win on its own, but it can be influential in that it can help the opposite party win.