From all I have heard and read - there was no other country in Europe so utterly convinced of its own invincibility. Despite the unexpected danger that Britain faced in the second half of 1940 only a handful of pessimists ever seriously thought that Germany could invade. Fortunately, this confidence wasn't ill founded. Though one can point to blunders in the 1930s, Britain had rearmed just about sufficiently in those areas that mattered most. The nation was solidly united from May 1940 onwards and prepared to make immense sacrifices. Of course, there was a huge difference between successful defense and the much harder task of bringing the Third Reich down, but it was a start.
"Modern" technology was used. More dangerous weaponry such as grenades, machine guns, and poisonous gasses took higher casualties on the opposing armies. There are likely more complex differences, but those are off the top of my head.
The death toll was substantially higher for both civilians and military forces
World War II was different from all other wars because it was the first, last and only time the atomic bomb was used as a weapon.
World War II was the first war in history where civilian deaths outnumbered military deaths due to saturation bombing.
Great Britain declared war on Germany in September 1939 after Germany invaded Poland.
Great Britain teamed up with the Allies.
Germany was TOO imperialistic, and they forced Britain into the war.
Germany
America, France and Canada all fought with Great Britain.
Great Britain, or more correctly The United Kingdom of Great Britain and Northern Ireland, was involved in both World War 1 and World War 2.
world war 1
There were many countries that were controlled by Great Britain at the beginning of World War 1.
The whole war
Britain
George VI was king of Great Britain during World War 2.
World War 2 was of two alliances. The Axis, and the Allies. Great Britain and U.S.A were on the Allies side.
Britain had a coalition government during World War 2
Great Britain declared war on Germany in September 1939 after Germany invaded Poland.
Britain thought so much of World War I that they call it "The Great War". And there has not been a better war since. But since the great war was really a war about nothing, it really was a shabby endeavor.
World War II.
Great Britain teamed up with the Allies.