Germany was blamed for World War I primarily because of its aggressive policies and actions leading up to the war, its unconditional support ("blank check") to Austria-Hungary in their conflict with Serbia, and its militaristic ambitions to expand influence over Europe. Germany's leaders, particularly under Kaiser Wilhelm II, pursued a strong nationalist and militaristic agenda, including a naval arms race with Britain and a willingness to escalate conflicts, which helped turn a regional conflict into a full-scale war. Additionally, Germany's invasion of Belgium broke international treaties and brought Britain into the war. The Treaty of Versailles after the war placed full blame for the war on Germany in its War Guilt Clause, making Germany responsible for reparations and losses, a point that historians have debated over time but which was politically motivated by the victors of the war. Germany was also one of the few Central Powers nations still intact at the war's end, so it bore the brunt of blame and penalties. Overall, Germany's militaristic and expansionist posture combined with the strategic alliances and mobilizations created conditions that made World War I more likely and more extensive than it might otherwise have been.