<Tr> <Td> <Ul> <Li> Absolute </Li> <Li> Legalist </Li> <Li> Constitutional </Li> <Li> Parliamentary </Li> <Li> Directorial </Li> <Li> Semi-presidential </Li> <Li> Presidential </Li> </Ul> </Td> </Tr> <Ul> <Li> Absolute </Li> <Li> Legalist </Li> <Li> Constitutional </Li> <Li> Parliamentary </Li> <Li> Directorial </Li> <Li> Semi-presidential </Li> <Li> Presidential </Li> </Ul> <Tr> <Th> Authoritarian vs. Libertarian socio - economic ideologies </Th> </Tr> <Tr> <Td> <Ul> <Li> Tribalism </Li> <Li> Despotism </Li> <Li> Feudalism </Li> <Li> Colonialism </Li> <Li> Capitalism </Li> <Li> Minarchism </Li> <Li> Distributism </Li> <Li> Anarchism </Li> <Li> Socialism </Li> <Li> Communism </Li> <Li> Totalitarianism </Li> </Ul> </Td> </Tr>

The us does not have a unitary form of government because