Good question. A story is considered Underreported in the US when it meets all of these criteria:
Category = politics, law & justice, society, climate & environment or health Public interest = News is mostly of public interest (Public interest > 0.5) Geographic relevance = US (directly affecting US institutions, policy, the economy, security, or population, or primarily driven by US actors)
The coverage has:
No more than 1 article from a US outlet No more than 3 articles from US outlets and wire services combined At least 2 different non-US regional outlets More than half of all articles are from non-US regional outlets