Time and War - What a Different World!

It's been some time since I have mulled over the issue of Man's constant companion; namely (and sadly), War-
I was thinking today of the world in the last century, experiencing History's most defining war:
It took Hitler about six weeks to conquer France.
In about four months, England won the Battle of Britain, leading to Hitler's decision to invade Russia in 1941 without defeating Britain, therefore activating a two-front war which insured the eventual destruction of Hitler and Nazism.
Only six months after Pearl harbor, Japan's offensive campaign in the Pacific was permanently destroyed in the Battle of Midway, paving the way to the defeat of the Japanese Empire.
It took approximately nine seconds to obliterate the city of Hiroshima.
In our present day, War and Time have formed a different equation.
Be reminded that the Second World War, the world's most devastating conflict, lasted for about five and two-thirds years.
In our present time period, palpably disconnected from the two great wars of the last century, there are no borders to cross over.
It has been almost a decade since the horror of 9/11, in 2001.
There are now countless soldiers throughout the world without uniforms.
And our world is in perhaps its deepest peril.
How different our world has become.