To aid the North Korean-Chinese forces against the United Nations Forces<span>.</span>
German declaration of Submarine Warfare
Zimmerman Telegrams
The Southern Manifesto was a document written in the South in 1956, which attempted to push back against Brown V. Board of Ed., which stated that racial segregation in school was illegal. Their argument being that the US Constitution nowhere mentions education.
I believe they were both harmed by nuclear radiation. Hiroshima was when the USA bombed Japan with a nuclear bomb. Chernobyl is the disaster in which a reactor caught fire and caused the harmful radiation to spread. I hope that was helpful. :)