How do ordinary people participate directly in a genocide?

In the 1950s the house of un-american activities committee blacklisted 320 people who are associated with-

Which statement best evaluates the impact of the 1929 stock market crash on europe? 1. the united states established high export tariffs to europe that reduced goods exported to germany. 2. the united states promoted domestic policy initiates that reduced jobs on american bases in europe. 3. the united states promoted isolationism that withdrew troops from europe causing germany to pay its own national defense. 4. the united states eliminated loans to europe that caused germany to default on its reparation payments to france.

This map shows north korea and south korea today. how does this map reflect the impact of the korean war?