| Keyword type | Examples |
| [ethnic group] | african american* arab* hispanic american* |
| [event] | holocaust jewish 1939 1945 tiananmen square incident world's columbian exposition |
| [gender] | women* |
| [location] | clinton north america pacific northwest minnesota united states |
| [nationality] | american french |
| [topic] | race relations radicalism |
| [war] | napoleonic wars united states history revolution 1775 1783 vietnamese conflict |