Answer:world war 1 started by franz Ferdinand who was the archduke of Austria was assassinated by a Serbians gang member of the black hand.So the countries were being allied and Britain,and France wanted to support Russia go to war.Germany wanted to support Austria-Hungary.and Russia wanted to help Serbia go to war and they did.
Second World War :
And then in around 1939 hitler invaded Poland
From the west, then 2 days later France and Britain was declaring war on Germany.And finally in 1945 in September the war ended and Germany lost like nearly 600k soldiers in war and Germany lost because of the Soviet Union.So Britain did win the war
Explanation:
<span> the </span>Monroe Doctrine<span>.i think</span>
