Not only does 2014 mark the 100th anniversary of World War One, it is also the 75th anniversary of the start of World War Two.  Britain declared war on Germany on 3 September 1939, following Nazi Germany’s invasion of Poland on 1 September.  Take a look at the newspaper headlines from Sunday 3 September, announcing that Britain was at war once more.Search newspapers from World War TwoNewspaper headlines from the beginning of WW2Derby Daily Telegraph | Sunday 3 September 1939Portsmouth Evening News prints WW2…