| A | B |
| Great Depression | voters became more likely to vote for Democrats |
| Cold War | voters become more likely to vote for Republicans |
| Vietnam | voters were less supportive of US involvement in world events/conflicts |
| Watergate | voters were more distrustful of government |
| 9/11 | voters supported more intrusive government actions to protect citizens |
| Civil Rights Act (1964) | Blacks vote loyally for Democrat Party (85-90%+ most elections) |
| Life-cycle events | youth, marriage, owning a house (from more liberal to more conservative) |
| 18-29 years olds | this group is more likely to vote for Democrats |