From paper to PC, the machinery of democracy has changed through the years.
Massachusetts becomes the first state to adopt a uniform ballot.
Lever voting machines are used in nearly all major U.S. cities.
Punch-cards and computer tally machines debut in two Georgia counties.
More than 7 percent of U.S. voters use direct recording electronic systems to capture votes digitally.
Oregon becomes the first to use iPads for touch-screen voting.
Clemson University develops voting software that users can download to a smartphone or tablet.