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Archduke Franz Ferdinand was assassinated which triggered a series of events leading to WWI, and the US was involved in WWI -
On this day Germany invaded Belgium which caused Great Britain to declare war, this marked the start of WWI. This triggered WWI which the USA was involved in. -
The RMS Lusitania was sunk by German U-boats because it was carrying war material, but it was also carrying passengers, which is how it involved the USA because 128 Americans died on the ship. -
On this day the Bolsheviks overthrew the Russian government. This involved the US because the Bolsheviks were communists which the US wanted to spread democracy around the world. -
On this day the British intercepted and decrypted a telegram sent to Mexico by the Germans. This involved the US because the Germans wanted to form an alliance with Mexico and allow unrestricted submarine warfare which would be bad for the US. -
On this day the USA declared war on Germany, joining France, Great Britain, Russia, Canada, Australia, New Zealand, South Africa, and Italy -
This battle was fought in the Asiago Plateau and was between Austria-Hungary and Italy, Italy suffered great casualties with up to 23,000. The US was involved because in a few months they joined the Italian troops to eventually take down Austria-Hungary. -
The Sedition Act extended the Espionage Act that took a year before. It covered a broad range of offenses like speech and expression of opinion that interfered with the sale of government bonds. -
On this day an armistice was signed between the Germans and allies ending hostilities until a permanent resolution would be discussed. -
This was a peace treaty signed between the allies and Germany which officially ended World War 1.