Party Systems:
No party --- no political parties are allowed to compete with the ruler's authority --- Oman, Qatar, Saudi Arabia
Single party --- only one party is legally allowed. Any minor parties are subordinate --- China, Cuba, NK, Vietnam
Dominant party --- one party is almost always in government, whether alone or coalition --- SA, Russia, Japan, Hungary
Two party --- two major parties compete to form single-party governments --- USA, UK
Multi-party --- the legislative is composed of several minority parties, leading to government by coalition or a minority party