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In page Politics of the United States:

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There are major differences between the political system of the United States and that of many other developed countries, including:

  • a separation of powers between the legislature and the executive; and
  • a political landscape dominated by only two main parties. The United States is one of the world's only developed countries where all additional parties have minimal or nonexistent influence and almost no representation at the national and state level. Causes for this mainly focus on the plurality-based first-past-the-post voting system, used in most elections, which encourages strategic voting and discourages vote splitting. This also results in both major parties having multiple internal factions.[citation needed]