Can I sue the homeowner or the USPS for a 40 pound steel mailbox that killed my wife?

Question Details: An extremely large mailbox 10'w x12.5't x22'l made of 1/8' steel set on a 3' steel post. Face of box was only 6' from edge of road. Only half of the car was off the pavement on an undivided rual road. She hit the mailbox and it came into the car and hit her in the face killing her instantly. The car rolled to a stop and remained running and driveable. She was only a quarter mile from home. If she would have hit any other regular mailbox she could have corrected herself and drove home. I found the lid to the mailbox inside the car with her blood splattered on it. Is there a criminal case? Is there a civil case?

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