In American politics, the left-right divide is not a modern explanation for politics because both sides are influenced by similar underlying forces

Government policies, elections, institutions, political movements, and public debates shaping civic life within the United States.

Organizations that contest American elections and coordinate agendas, candidates, donors and governing coalitions at national, state and local level. Their formal committees hold less power than the primaries, media and money that increasingly determine who runs under a party label.