By the time we got in many of the casualties had already occurred, and Europe was a seething revolutionary and materially destroyed mess. We also at least were the catalyst that finished the stupidity.
Now if the the Brits sit it out in 1914 and Germany defeats France and Russia which it almost certainly does in a limited war, things are way different in the post war world. This is a subject of endless debate among historians.
This message has been edited 1 time(s).