[devonin]

Circumstantial evidence along with motive and capability can prove possibility which is almost enough to hang a court case.

Believe me, I did fairly in-depth research into this one for a proposed paper I was going to write for an American History class in university. There was and is not nearly enough evidence to come close to enough to support a court case. The most telling evidence that the americans either knew the ship was going to be attacked, or attacked it themselves was that at the time of its sinking, the entire crew of the ship was african-american (Which in 1890s US tells you something potentially significant) but that doesn't come close to being convictable evidence by any standard.