Atomic weapons negate declarations of war.
No.
germany
Pearl Harbour.
Germany
On Japan.
the us didn't declare war on china in world war 2 us declared war on japan on 1941 when japan bombed pearl harbor hawii
only on US
mostely politcical problems
neutral
on decmber 8 1941
11th December 1941, shortly after German's declaration
RMS Lusitania was sunk by German U boatThe US did declare war on Germany during the World War 1 because Germany had offered Texas, California, Arizona and New Mexico to Mexico.