U.S. Primary System Complexity: Historical Origins and Modern Impact The American primary election system evolved gradually—Iowa's caucuses began in 1972, while New Hampshire formalized its "first in the nation" primary status through state law in 1975. Today, this fragmented process means candidates must navigate 50 different systems with varying dates, rules, and delegate allocation methods, costing campaigns $2+ billion per cycle. This structure, rooted in Cold War-era party reforms, concentrates power in early states (Iowa and New Hampshire combined represent ~1.5% of U.S. population but receive 40%+ of candidate attention), effectively filtering viable candidates before most Americans vote. Understanding this matters because frontloaded spending and media coverage in these early contests determine which candidates remain viable, often deciding races before Super Tuesday—meaning the preferences of 3-4 million early voters in unrepresentative states substantially shape options for 150+ million general election voters.