Did Britain change our World map for the worse during the first half of the C20TH?

Yes, thank you for pointing it out. Even jumping in the great war, "WW1", was unnecessary. The fewer nations that got involved the better things would be. Germany wanted to unify the German people after their towns were swallowed up in re-drawing the map after WW1. England didn't have to get involved and make things a lot worse. England did in the Falkland Islands in 1982 what Germany did in 1939 to regain their former lands. Imagine if every other nation picked sides and jumped in fighting each other too because of it.