1917 ⟶ United States Enters World War I

April 6: USA joins the Entente for the last 17 months of Wor...
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Year
1915
1916
1917
1918
1939

🚢 Sinking of the RMS Lusitania by German U-Boat

May 7: Sinking of the RMS Lusitania.⟶
Sinking of the RMS Lusitania by German U-Boat (1915)
World War INaval WarfareAtrocityPropaganda
United KingdomUnited KingdomGermanyGermanyUnited StatesUnited States

⚔️ Battle of the Somme: Brutal Trench Warfare and Mass Casualties

July – November: Battle of the Somme on Western Front; massive casualties.⟶
Battle of the Somme: Brutal Trench Warfare and Mass Casualties (1916)
World War IWestern FrontTrench WarfareMilitary History
FranceFranceUnited KingdomUnited KingdomGermanyGermany

🇺🇸 United States Enters World War I

April 6: USA joins the Entente for the last 17 months of World War I.⟶
World War IAlliancesMilitary InterventionGlobal ConflictInternational RelationsWoodrow WilsonWarfareWestern Front
United StatesUnited StatesFranceFranceUnited KingdomUnited KingdomGermanyGermany

💥 Hundred Days Offensive: Allied Victory and German Collapse

August–November: The Hundred Days Offensive sends Germany into defeat.⟶
Hundred Days Offensive: Allied Victory and German Collapse (1918)
World War IWestern FrontAllied PowersCentral PowersTrench WarfareMilitary OffensiveArmisticeGerman Empire
GermanyGermanyFranceFranceUnited KingdomUnited KingdomUnited StatesUnited StatesBelgiumBelgium

💣 Britain and France Declare War on Germany

September 3: Britain and France declare war on Germany; World War II begins.⟶
World War IIAxis PowersAllied PowersGlobal ConflictTotal War
United KingdomUnited KingdomFranceFranceGermanyGermany