If this is during WWI then this could spread to widespread war because of the alliance systems
Charles Darwin proposed that theory looking at birds in the Galapagos islands.
Knowledge, freedom, and happiness! Hope this helped!
"The reason why Britain didn’t declare war on the Soviet Union is an
intriguing one. Unknown to the general public there was a ‘secret
protocol’ to the 1939 Anglo-Polish treaty that specifically limited the
British obligation to protect Poland to ‘aggression’ from Germany" http://www.historyextra.com/qa/why-did-britain-and-france-not-declare-war-soviet-union-when-red-army...
The United Kingdom in the Battle of Britain.