Several historians believe Germany was responsible for starting WWI due to its policy of "Welt Politik" and evidence from diplomatic papers like the "Blank Cheque", which guaranteed support for Austria in the event of war. However, German historians at the time refuted these claims despite Germany accepting guilt in the Treaty of Versailles. Later historians like Gooch argued guilt should be shared among the major European powers, as hardships from the treaty created sympathy for Germany and a re-examination of the evidence.