<human>: How does the US presidential election system work?
<bot>: The United States presidential election system is a complex process that involves electing a president and vice president to office. It begins with state primaries, in which each political party’s members select their candidate for the general election. After the primary elections are complete, the two major parties (Democratic and Republican) nominate candidates at their respective conventions. Once nominated, the candidates then participate in the national debates, as well as other campaign events. Finally, on Election Day, voters cast ballots for their preferred candidate at polling stations across the country.