Infographie première guerre mondiale : frise 1914-1919

Historical timeline infographic titled "World War I: From Spark to Settlement" with a dominant HORIZONTAL timeline ribbon spanning 1914 to 1919, designed as a rise-to-fall full arc with the macro structure overlaid above the ribbon as "Rise → Peak → Decline → Fall". Show 9 clearly separated milestone panels along the ribbon, each with precise date or year, a short heading in English, a one-line caption in English, and a period-appropriate visual cue. Milestones: 1) "28 June 1914" — "Assassination at Sarajevo" — "Archduke Franz Ferdinand is killed, igniting the July Crisis." — visual cue: pistol, black mourning ribbon, imperial carriage. 2) "28 July 1914" — "Austria-Hungary Declares War" — "The conflict begins as alliances pull Europe into war." — visual cue: diplomatic telegram, mobilization orders, marching troops. 3) "4 August 1914" — "Britain Enters the War" — "Germany's invasion of Belgium brings Britain into the conflict." — visual cue: map arrow through Belgium, British helmet, treaty document. 4) "6-12 September 1914" — "First Battle of the Marne" — "The German advance is halted and trench warfare takes hold." — visual cue: trench line, barbed wire, artillery smoke. 5) "22 April 1915" — "Second Ypres" — "Large-scale poison gas attacks reveal the war's brutal new technology." — visual cue: gas cloud, early gas mask, shattered tree. 6) "21 February-18 December 1916" — "Battle of Verdun" — "One of the longest battles becomes a symbol of attrition and endurance." — visual cue: fortress silhouette, heavy artillery, cratered battlefield. 7) "1 July-18 November 1916" — "Battle of the Somme" — "Massive offensives bring enormous losses with limited gains." — visual cue: whistles, trenches, machine gun nest. 8) "6 April 1917" — "United States Enters the War" — "American entry strengthens the Allied war effort decisively." — visual cue: troop transport ship, U.S. flag patch, convoy arrows. 9) "28 June 1919" — "Treaty of Versailles" — "The peace settlement formally ends the war and redraws Europe." — visual cue: signed diplomatic documents, fountain pen, conference table. Include a small inset map labeled "Europe at War, 1914-1918" showing Central Powers and Allied Powers, plus a second tiny territorial reach element labeled "Front Lines and Global Theaters" with arrows to Western Front, Eastern Front, Middle East, and colonial theaters. Add key figures in elegant side portraits with captions and dates: "Woodrow Wilson (1856-1924)", "Kaiser Wilhelm II (1859-1941)", "Georges Clemenceau (1841-1929)". Use modern-era period-appropriate military uniforms, helmets, trench warfare imagery, barbed wire, artillery, diplomatic papers, railway mobilization, troop movements, and armistice-era statesmen. Visual style: editorial historical illustration, textbook-grade clarity, period-appropriate imagery, vector-clean lines, sepia & gold palette, archival paper texture, sharp readable typography, balanced infographic layout, sober and reflective mood. All text rendered cleanly in English, no spelling errors, no gibberish characters, no watermarks Render dates in Arabic numerals. Avoid graphic battlefield gore, no real death photos, no flags or symbols of hate movements. For contested historical narratives, present neutrally — no propaganda framing, no glorification of atrocities. Period-appropriate but tasteful.