How has two party system affected the history of American government?

The "two party system" of "anglo+usa" tradition is in fact a one party system. Two wings of a one party system sharing the power. The to wings have agreed on an election system, which because of election mathematics will ensure the two "party" system to retain the power. Such a system is unacceptle in continental Northern Europe where a represental system and parlamentarism is generally used. These Words also are used in UK+USA, but have a different meaning in continental Europe.