Causes of WW1. The period of time between the late 1800s and the early 1900s was one of great political change and instability. It marked the lead up to one of the greatest wars in history and was filled with challenges based on nationalism, imperial rivalry, colonial rivalry, and international alliances. Possibly the earliest significant event in the wind-up to WWI was in 1839 where, through the Treaty of London, Belgium's neutrality was ensured by Britain, …showed first 75 words of 1320 total…

…showed last 75 words of 1320 total…attitude towards the situation. Russia fails to stop its mobilisation and therefore Germany declares war on Russia. In order to be able to perform its sole war plan (aka Schlieffen Plan) Germany on the 03/08 declares war on France. A day later German troops enter Belgium, and in honouring of the Treaty of London, Britain declared was on Germany. With Britain and its colonies now involved in conflict the war had become the First World War.