structural:summarization, information:highlighting, quality:correction
Europe vs. the United States

The contemporary concept of federalism came about with the creation of an entirely new system of government that provided for democratic representation at two governing levels simultaneously, which was implemented in the US Constitution. In the United States implementation of federalism, a bicameral general government, consisting of a chamber of popular representation proportional to population (the House of Representatives), and a chamber of equal State-based representation consisting of two delegates per State (the Senate), was overlaid upon the pre-existing regional governments of the thirteen independent States. With each level of government allocated a defined sphere of powers, under a written constitution and the rule of law (that is, subject to the independent third-party arbitration of a supreme court in competence disputes), the two levels were thus brought into a coordinate relationship for the first time.