On January 1, 1915, audiences file into the Loring Opera House at 3745 7th Street in Riverside, California, for a sneak preview of D.W. Griffith’s first full-length feature film, The Clansman. Later renamed The Birth of a Nation, the controversial Civil War epic would become Hollywood’s first blockbuster hit.

During World War I, Britain suffers its first casualties from an air attack when two German zeppelins drop bombs on Great Yarmouth and King’s Lynn on the eastern coast of England.

In the country’s first such action against American shipping interests on the high seas, the captain of a German cruiser orders the destruction of the William P. Frye, an American merchant ship.

On January 29, 1915, in the Argonne region of France, German lieutenant Erwin Rommel leads his company in the daring capture of four French block-houses, the structures used on the front to house artillery positions.

A full two years before Germany’s aggressive naval policy would draw the United States into the war against them, Kaiser Wilhelm announces an important step in the development of that policy, proclaiming the North Sea a war zone, in which all merchant ships, including those from neutral countries, were liable to be sunk without warning.

On February 8, 1915, D.W. Griffith’s The Birth of a Nation, a landmark film in the history of cinema, premieres at Clune’s Auditorium in Los Angeles. The film was America’s first feature-length motion picture and a box-office smash, and during its unprecedented three hours Griffith popularized countless filmmaking techniques that remain central to the art today. However, because of its explicit racism, Birth of a Nation is also regarded as one of the most offensive films ever made.

After encountering a severe snowstorm on the evening of February 17, 1915, the German zeppelin L-4 crash-lands in the North Sea near the Danish coastal town of Varde.

Director D.W. Griffith’s controversial Civil War epic The Birth of a Nation opens in New York City on March 3, 1915, a few weeks after its West Coast premiere in Los Angeles. A 40-piece orchestra accompanied the silent film. The movie, at 2 hours and 40 minutes, was unusually long for its day and used revolutionary—for the time—filmmaking techniques, including editing, multiple camera angles and close-ups. However, the film, originally entitled The Clansman, was denounced by the NAACP, among others, for its negative portrayal of African Americans.

On March 28, 1915, the first American citizen is killed in the eight-month-old European conflict that would become known as the First World War.

On April 22, 1915, German forces shock Allied soldiers along the Western Front by firing more than 150 tons of lethal chlorine gas against two French colonial divisions at Ypres in Belgium.

On April 22, 1915, German forces shock Allied soldiers along the western front by firing more than 150 tons of lethal chlorine gas against two French colonial divisions at Ypres, Belgium. This was the first major gas attack by the Germans, and it devastated the Allied line.

On April 23, 1915, Rupert Brooke, a young scholar and poet serving as an officer in the British Royal Navy, dies of blood poisoning on a hospital ship anchored off the Greek island of Skyros, while awaiting deployment in the Allied invasion of the Gallipoli Peninsula.

On April 25, 1915, a week after Anglo-French naval attacks on the Dardanelles end in dismal failure, the Allies launch a large-scale land invasion of the Gallipoli Peninsula, the Turkish-controlled land mass bordering the northern side of the Dardanelles.

On April 26, 1915, after receiving the promise of significant territorial gains, Italy signs the Treaty of London, committing itself to enter World War I on the side of the Allies.

On May 1, 1915 in The Hague, Netherlands, the International Congress of Women adopts its resolutions on peace and women’s suffrage.

On the afternoon of May 7, 1915, the British ocean liner Lusitania is torpedoed without warning by a German submarine off the south coast of Ireland. Within 20 minutes, the vessel sank into the Celtic Sea. Of 1,959 passengers and crew, 1,198 people drowned, including 128 Americans. The attack aroused considerable indignation in the United States, but Germany defended the action, noting that it had issued warnings of its intent to attack all ships, neutral or otherwise, that entered the war zone around Britain.

On May 9, 1915, Anglo-French forces fighting in World War I launch their first combined attempt to break through the heavily fortified German trench lines on the Western Front in France.

“Since leaving Paris yesterday we have passed through streets and streets of such murdered houses, through town after town spread out in its last writhings,” the celebrated novelist Edith Wharton writes on May 13, 1915, from the town of Nancy, in the Argonnes region of France. “And before the black holes that were homes, along the edge of the chasms that were streets, everywhere we have seen flowers and vegetables springing up in freshly raked and watered gardens.”

On May 23, 1915, Italy declares war on Austria-Hungary, entering World War I on the side of the Allies—Britain, France and Russia.

On June 3, 1915, Austro-Hungarian and German troops recapture Przemysl fortress (now in Poland), from Russian forces. The citadel guarding the northeastern-most point of the Austro-Hungarian Empire had been held by Russian soldiers for several months.

On June 9, 1915, United States Secretary of State William Jennings Bryan resigns due to his concerns over President Woodrow Wilson’s handling of the crisis generated by a German submarine’s sinking of the British passenger liner Lusitania the previous month, in which 1,201 people—including 128 Americans—died.

On June 25, 1915, the German press publishes an official statement from the country’s war command addressing the German use of poison gas at the start of the Second Battle of Ypres two months earlier.

On July 9, 1915, with the Central Powers pressing their advantage on the Western Front during World War I, the Allies score a distant victory, when military forces of the Union of South Africa accept a German surrender in the territory of Southwest Africa.

On July 24, 1915, the steamer Eastland overturns in the Chicago River, drowning between 800 and 850 of its passengers who were heading to a picnic. The disaster was caused by serious problems with the boat’s design, which were known but never remedied.

On September 8, 1915, a German Zeppelin commanded by Heinrich Mathy, one of the great airship commanders of World War I, hits Aldersgate in central London, killing 22 people and causing £500,000 worth of damage.

On September 27, 1915, Second Lieutenant John Kipling of the British army, the only son of Nobel Prize-winning author Rudyard Kipling, is killed at the Battle of Loos, in the Artois region of France.

On October 11, 1915, Prime Minister Vasil Radoslavov of Bulgaria issues a statement announcing his country’s entrance into the First World War on the side of the Central Powers.

On the morning of October 12, 1915, the 49-year-old British nurse Edith Cavell is executed by a German firing squad in Brussels, Belgium.

With war raging in Europe, conflict also reigns in the Far East between two traditional enemies, Japan and an internally divided China. On December 11, 1915, the first president of the new Chinese republic, Yuan Shih-kai, who had come to power in the wake of revolution in 1911 and the fall of the Manchu Dynasty in 1912, accepts the title of emperor of China.

On December 18, 1915, President Woodrow Wilson marries Edith Galt in Washington, D.C. The bride was 43 and the groom was 59. It was the second marriage for Wilson, whose first wife died the year before from a kidney ailment. Edith, who claimed to be directly descended from Pocahantas, was the wealthy widow of a jewelry-store owner and a member of Washington high society.