Africa

China

Southeast Asia

The Middle East (or West Asia)

Central Asia

The assassination of Archduke Franz Ferdinand

The ascension of Kaiser Wilhelm II to the Prussian throne

The sinking of the Lusitania

The breakdown of diplomatic relations between Austria and Germany

Rising tensions over who controlled Alsace-Lorraine

American air bombing of Tokyo and other parts of Honshu Island in 1942 in response to the attack on Pearl Harbor that demonstrated Japan was vulnerable to air attack.

American-led assassination attempt on Adolf Hitler in 1943 that was ultimately unsuccessful.

British surprise bombing on Berlin in 1941 that destroyed 20% of the city at the time.

Code name for the massive Allied offensive into Italy in 1943 that started in Sicily.

German submarine operation that patrolled the Atlantic in attempts to sink Allied supply shipments from the U.S.

The Great Patriotic War

The Soviet-German War

The Fascist War

The War of Fascist Agression

The War of the Motherland's Defense

Spain

Italy

Czechoslovakia

Austria

The Soviet Union

X-ray imaging

Rocket technology

Jet aircraft

Penicillin

The creation of the Selective Service System, the modern conscription apparatus used by the United States in times of war

The temporary requisitioning of all privately held fully automatic weapons in the continental United States for the war effort, due to a lack of machine guns in the United States' arsenal

The playing of the Star-Spangled Banner was made mandatory at all public events "of sufficient size and caliber" in order to foment patriotism and nationalistic fervor in favor of the war

American women were allowed to enter the rank-and-file military for the first time due to shortages of able-bodied men to be on the front line

All media outlets had to consult with the government to make sure news stories wouldn't betray military or state secrets before publishing

To attempt a drive on Istanbul/Constantinople, knocking the Ottoman Empire out of the war and opening a supply route through the Black Sea to resupply increasingly desperate Russian troops on the Eastern Front

To grant Britain a foothold in the Middle East for post-war imperial expansion in anticipation of the Sykes-Picot agreement

To require the Germans to draw massive numbers of troops away from the areas of the Entente's main thrust in France and Belgium, allowing the Entente to break the multiyear stalemate

To show the world the skill and prowess of the newly formed Australia New Zealand Army Corps (ANZACs), a group of colonial subjects who would later be renowned for fighting prowess, stubbornness in battle, and irreverence for authority

To gain access to gold reserves in Istanbul/Constantinople, dearly needed due to shortages of precious metals with which the Entente was required to pay for American shipments of armaments, food, and other supplies

The Treaty of Brest-Litovsk between Germany and the Soviet Union, signed in March 1918

The introduction of American ground troops on the Western Front in the Spring of 1918

The long-term success of the British blockade against German ports

Socialist revolts and mutinies in various areas within Germany during the fall October and early November 1918

The surrender of German allies Austria-Hungary, Bulgaria, and the Ottoman Empire during September and October 1918

Defeating France quickly in the West before needing to defend against a Russian attack from the East

Ensuring that Great Britain did not enter the war as an ally of France

Avoiding an attack by Italy against Austria-Hungary

Defeating the Serbian uprising precipitated by the assassination of Archduke Franz Ferdinand

Not violating Belgian neutrality