The correct option is "political parties"
The country is composed of 50 autonomous states in its internal regime. The main political parties are the Republican Party and the Democratic Party, which dominate the political scene, which is why some consider the system of this country as a bipartisan democracy. Other minor parties are the Green Party, the Constitution Party and the Libertarian Party. However, they have practically no representation because the Democratic and Republican parties have more than 95% of territorial representation.
The Constitution of the United States of September 17, 1787 with its 7 articles and its 27 subsequent amendments, defines that the United States is a Republic with a representative and federal system with three separate, defined powers, which are balanced among themselves and administered in their executive branch by a president elected for a term of 4 years with a possible re-election for a single term.