A two-party system is a type of party system where two parties dominate political life. In the countries described by the term, other parties are also legal and active, and therefore it should not be confused with a one-party state, where parties other than the ruling party are generally illegal, but these parties do not have almost any political relevance at the national level.
It has been stated, among other things, that such systems always offer two clear government alternatives, and that the relevance of personal elections is considered to increase, as personal positions on various issues become increasingly important.
The Andes were formed by tectonic activity whereby earth is uplifted as one plate (oceanic crust) subducts under another plate (continental crust). ... When this large portion of dense material was removed, the remaining portion of the crust underwent rapid uplift.
