sinking of lusitania
Germany wanted more land for larger population, its military actions led to war. And for Japan wanted natural resources; its military actions led the U.S. to threaten sanctions before Japan launched a surprise attack on it.
Germany invaded Poland and Japan invaded China.
Both were subjected to unprovoked attack, The USSR by Germany and the US by Japan.
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Germany entered neutral Belgium on August 4, 1914, Britain then gave an ultimatum to Germany to leave the country. That was refused, and the UK declared war later that same day.
Germany declared war on Poland, which led to England and France declaring war on Germany.
After ww1 Germany was led by adolf Hitler
Germany broke the rules of World War I primarily through its use of unrestricted submarine warfare, which violated the principles of neutral shipping rights. The sinking of civilian ships, including the Lusitania, led to international outrage and contributed to the United States entering the war. Additionally, Germany's use of chemical weapons and its aggressive military strategies, such as the invasion of Belgium, also violated established wartime conventions. These actions ultimately undermined Germany's position and credibility in the conflict.
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Germany was sinking cargo ships supplying the Allies (Britain, France) and temporarily halted its policy of unrestricted submarine warfare. The resumption of this policy, combined with other factors, led to the US declaration of war in 1917, some three years after the fighting began in 1914.
The Second World War started primarily due to the aggressive actions of Nazi Germany, led by Adolf Hitler. Germany's invasion of Poland in 1939 triggered the outbreak of the war, as it prompted Britain and France to declare war on Germany, escalating the conflict into a global scale.