Before revision: Background Humanitarian aid agencies tend to employ European and North Americans into senior leadership roles and tend to hire staff from countries more commonly affected by crises into more junior, local roles, thus blocking local staff from occupying positions of power .
After revision: Background Humanitarian aid agencies tend to employ European and North Americans into senior leadership roles and tend to hire staff from countries more commonly affected by crises into more junior, local roles, thus blocking local staff from senior leadership roles .