The United States declaration of war against Germany during World War I was influenced by events such as the sinking of the Lusitania and Germany's unrestricted warfare tactics.
Germany sinks the British passenger ship Lusitania. - This event occurred in 1915, causing the death of over a hundred Americans and escalating tensions.
Germany begins unrestricted warfare. - In February 1917, Germany resumed unrestricted submarine warfare, leading to further hostilities.
The United States declares war against Germany. - On April 6, 1917, the United States officially entered World War I by declaring war on Germany.
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