Everybody doesn't have the same thoughts or needs in the same regions around the world. Usually history makes the government. Long ago, if someone grew up rich, they could build a army and take over much land creating a monarchy. Tradition, beliefs, and thoughts always created different governments and policies. One person thinks this is best, well there will always be someone who thinks the opposite.
Monarchy- A powerful ruler who makes the decision right away, usually was done in the past when military action had to come right away, rather then go through several government branches.
Democracy is breaking out in huge numbers now because people want there voice heard these days and they want the opportunity to speak up and tell there problems.