* Parliamentary government
* Constitutional monarchy
* Unitary state
* Bicameral legislature (National Diet)
* Universal suffrage
* Multi-party system
* Free market economy
* Member of the United Nations
United States
* Presidential government
* Constitutional republic
* Federal state
* Bicameral legislature (Congress)
* Universal suffrage
* Two-party system
* Capitalist economy
* Member of the United Nations
Similarities
* Both Japan and the United States are democratic countries.
* Both countries have a bicameral legislature.
* Both countries have a free market economy.
* Both countries are members of the United Nations.
Differences
* Japan has a parliamentary government, while the United States has a presidential government.
* Japan is a constitutional monarchy, while the United States is a constitutional republic.
* Japan is a unitary state, while the United States is a federal state.
* Japan has a multi-party system, while the United States has a two-party system.