The Wannoshay Cycle

Aliens crash-land in snowy North America, attempt integration, and fail-violently. In the near future, over thirty black ships containing the aliens known as the Wannoshay crash-land onto the frozen earth of the Great Plains of America and Canada. Over the course of a year, the aliens attempt to become part of American society, only to be banished to internment camps when they are suspected of causing a series of deadly explosions at their new jobs.
A handful of humans who made early contact with the Wannoshay stand up for the oppressed aliens. They soon learn, however, that the aliens are not without guilt-a guilt that seems to be killing the Wannoshay with each passing day on Earth..."An absorbing work full of unflinching looks at what makes us human, how we might react to be faced with the truly incomprehensible." - SF Site