In 1870–1871, the Franco-Prussian War changed Europe forever. Before 1871, Germany was not one country—it was many German-speaking states. The strongest among them was Prussia.
Unification of Germany led by Prussia (Source: Britannica)
In a dramatic turn of events, Prussia fought a war against France (the Franco-Prussian War). Prussia’s victory was so decisive that the German states united and created the German Empire, proclaimed dramatically inside the Palace of Versailles near Paris.
Alsace-Lorraine, the territory contested between France and Germany after the Franco-Prussian War. (Source: Britannica)
France was deeply humiliated. Worse still, Germany took:
Alsace
Lorraine
These territories would haunt Franco-German relations for decades. From that day forward, many French people thought:
“One day we will recover our land.”
The seeds of future conflict were planted in 1871.
Chapter 2: Germany Becomes Europe’s New Giant (1871–1914)#
The Borsig locomotive and engineering factory in Berlin (1847), reflecting the growth of heavy industry that helped transform Germany into a major industrial power in the late 19th century. Source: Wikimedia Commons
Germany grew rapidly. It possessed unprecedented industrial strength:
Modern factories
Railway networks
Engineers and scientists
A strong army
German locomotive manufacturing in the 19th century, depicting the expansion of heavy industry and railway production that fueled Germany’s rapid industrial growth. Source: Wikimedia Commons (Deutsches Technikmuseum)
Germany became Europe’s strongest industrial power. This success created anxiety across the continent.
In 1882, Germany, Austria-Hungary, and Italy formed the Triple Alliance. Countries began forming alliances—not out of friendship, but out of fear. The logic was simple:
🇫🇷 France feared Germany’s power
🇷🇺 Russia feared Germany and Austria
🇬🇧 Britain feared Germany’s growing navy
These three countries gradually moved closer together, eventually creating the Triple Entente (completed in 1907):
Europe had become a giant armed camp. As one observer noted:
Europe before World War I, showing the major powers, alliance blocs, and regions of strategic rivalry. The complex network of alliances, nationalism, militarism, and imperial competition contributed to the outbreak of World War I in 1914. Source: History for Kids
The Triple Alliance and Triple Entente alliances in pre-WWI Europe. Source: History for Kids
Imagine two groups standing in a room holding matches while sitting on barrels of gunpowder. That was Europe in 1914.
Chapter 4: The Assassination at Sarajevo and the Road to War (1914)#
Illustration from the Italian newspaper Domenica del Corriere depicting Gavrilo Princip assassinating Archduke Franz Ferdinand and his wife Sophie in Sarajevo on 28 June 1914. The event triggered the July Crisis and ultimately led to the outbreak of World War I. Source: Wikimedia Commons
On June 28, 1914, in the city of Sarajevo, a Serbian nationalist did the unthinkable: he assassinated Archduke Franz Ferdinand, the heir to Austria-Hungary.
What followed was a cascade of decisions that would destroy an entire world:
A regional Balkan crisis triggered the alliance system like dominoes falling in slow motion. What was meant to be a regional dispute became a global catastrophe.
Chapter 5: World War I and the Tragedy of the Trenches (1914–1918)#
Everyone expected a short war. What they got instead was years of relentless slaughter.
Trench warfare on the Western Front during World War I. Opposing armies fought from extensive trench systems stretching across Europe, leading to a war of attrition characterized by heavy casualties and limited territorial gains. Source: Britannica
French troops positioned in a trench opposite German forces on the Western Front during World War I. The extensive trench systems stretching across Europe turned the conflict into a war of attrition marked by heavy casualties and military deadlock. Source: Britannica
Millions of soldiers lived and died in trenches, facing:
Machine guns
Artillery
Poison gas
German machine gun operators wearing gas masks during World War I. The conflict witnessed the large-scale use of modern military technologies such as machine guns, poison gas, tanks, and heavy artillery, making it one of the deadliest wars in history. Source: Wikimedia Commons
In February 1917, the February Revolution removed the Tsar from power.
Later that year, in October 1917, the October Revolution brought the Bolsheviks to power. Their leader, Vladimir Lenin, made a crucial decision: Russia would leave the war.
In 1918, Russia signed the Treaty of Brest-Litovsk and withdrew from WWI.
The Russian Empire collapsed before World War I even ended.
Russia collapsed and left World War I in 1918, removing Germany’s eastern front and allowing Germany to focus on the west.
However, Germany was already exhausted, and with the USA entering the war, Russia’s exit came too late to prevent Germany’s defeat later in 1918.
Chapter 7: Germany’s Final Offensive and Defeat (1918)#
The signing of the Treaty of Versailles in the Hall of Mirrors, Palace of Versailles, on 28 June 1919. The treaty ended World War I, held Germany responsible for the war through the War Guilt Clause, and imposed heavy reparations that contributed to political instability in Europe and the rise of Nazi Germany. Source: Britannica
In 1919, the victors met at Versailles to reshape the world. They created the Treaty of Versailles.
In 1920, to prevent future wars, countries created the League of Nations.
It sounded wonderful on paper. But in practice, it had little power.
When aggressive countries ignored it, the League could do almost nothing to stop them.
The League slowly became irrelevant. The world would need a stronger international system after WWII.
Chapter 10: Hitler’s Rise and Germany’s Rearmament (1933–1939)#
Adolf Hitler addressing a public rally in Germany, circa 1933. Economic hardship, political instability, and resentment over the Treaty of Versailles helped fuel support for the Nazi Party, paving the way for Hitler’s rise to power and the eventual outbreak of World War II. Source: Britannica
Many Germans embraced him. He delivered on some of his promises:
Rebuilt the military
Took territory
Restored German pride (in German eyes)
But other nations hoped he would be reasonable. He wasn’t.
Chapter 11: Imperial Japan and Expansion in Asia (1931–1941)#
Japanese expansion in Asia from 1931 to 1942. Driven by militarism, resource needs, and imperial ambitions, Japan occupied Manchuria, invaded China, and expanded across the Pacific, bringing it into direct conflict with Western powers and leading to the Pacific War. Source: Stratfor
But Japan had one critical weakness: it lacked natural resources. It desperately needed:
🛢️ Oil
⚙️ Iron
🌳 Rubber
🗺️ Land
So Japan expanded aggressively across Asia. In 1931, Japan occupied Manchuria. By 1937, Japan was already fighting China (the Second Sino-Japanese War)—a major Asian war that many Westerners barely noticed.
A major Asian war was underway before most people think WWII even began.
This resource explains Japanese militarism, the invasion of Manchuria, the Second Sino-Japanese War, the League of Nations’ response, and the road to Pearl Harbor
Chapter 12: The Invasion of Poland and the Beginning of World War II (1939)#
German forces invading Poland in September 1939. The attack prompted Britain and France to declare war on Germany, formally beginning World War II in Europe. The campaign demonstrated the effectiveness of Blitzkrieg warfare, which relied on speed, coordination, and surprise. Source: World History Encyclopedia
Britain and France had promised to defend Poland. Now they had to make good on that promise.
Britain and France declared war.
World War II had begun. The world would never be the same.
German troops hoisting the Nazi flag over Kraków Castle after the occupation of Poland in 1939. The invasion of Poland triggered World War II in Europe and demonstrated Germany’s aggressive expansionist policy under Adolf Hitler. Source: World History Encyclopedia
Chapter 13: Blitzkrieg and the Conquest of Europe (1939–1940)#
German Panzer tanks and mechanized infantry advancing through Ukraine during Operation Barbarossa in 1942. The coordinated use of armored vehicles, mobile infantry, and air power reflected the Blitzkrieg strategy that enabled Germany’s rapid early victories in World War II. Source: Wikimedia Commons (German Federal Archives / Bundesarchiv)
Germany bombed Britain relentlessly in what became known as “The Blitz” (1940–1941). The British people endured, their cities burning but their resolve unbroken.
For the first time, Hitler failed. Britain survived.
Chapter 15: Operation Barbarossa – Hitler Invades the Soviet Union (1941)#
Russia’s leaders have always feared invasion from the west. The North European Plain stretches deep into Russian territory with few natural barriers to stop an invader.
Russia had been invaded before:
Napoleon (1812)
Hitler (1941)
This historical trauma shapes Russian strategy to this day.
This is why Russian leaders constantly seek strategic depth:
➡️ More distance from Europe
➡️ More buffer space
➡️ More security
Geography shapes geopolitics. The flat plains of Eastern Europe continue to influence Russian foreign policy in the 21st century.
Chapter 17: Pearl Harbor and America’s Entry into the War (1941)#
A dramatic photograph of the USS Shaw exploding during Japan’s surprise attack on Pearl Harbor on 7 December 1941. The attack led the United States to declare war on Japan, transforming World War II into a truly global conflict. Source: Wikimedia Commons (U.S. National Archives and Records Administration)
The Battle of Stalingrad became the turning point of the entire war.
The Battle of Stalingrad was a major battle on the Eastern Front of World War II in which Nazi Germany and its Axis allies fought the Soviet Union for control of the city of Stalingrad in southern Russia. Marked by intense close-quarters combat and heavy civilian losses during aerial bombardment, the battle is considered the largest and deadliest urban battle in military history and the largest battle in World War II. By the end of the fighting, the German 6th Army had been destroyed, the 4th Panzer Army had suffered severe losses, and Army Group B was routed. The defeat reversed the momentum of Hitler’s invasion of the Soviet Union and shifted the balance on the Eastern Front in the Soviet Union’s favour. The Soviet victory at Stalingrad is generally considered the pivotal turning point of the European theatre of the war.
Allied landing ships delivering troops, vehicles, and supplies to Omaha Beach during Operation Overlord in June 1944. The Normandy landings enabled the liberation of Western Europe from Nazi occupation and accelerated the defeat of Germany. Source: Wikimedia Commons (U.S. Coast Guard / U.S. National Archives)
On June 6, 1944, the Normandy landings (D-Day) opened another major front against Germany.
Germany was squeezed from both sides, unable to concentrate its forces to stop either advance.
The end was inevitable.
Chapter 21: The Fall of Berlin and Hitler’s End (1945)#
In 1945, Soviet troops entered Berlin. The nightmare had come to pass.
Hitler died.
Germany surrendered.
Europe’s war ended.
The thousand-year Reich had lasted just 12 years.
Chapter 22: Hiroshima, Nagasaki, and the Atomic Age (August 1945)#
Mushroom clouds rising over Hiroshima (6 August 1945) and Nagasaki (9 August 1945) after the world’s first use of nuclear weapons in warfare. The bombings accelerated Japan’s surrender, ended World War II, and marked the beginning of the nuclear age. Source: Wikimedia Commons (U.S. Army Air Forces / Charles Levy)
Japan continued fighting even after Germany’s surrender in May 1945. American military planners faced a grim prospect: invading Japan would cost hundreds of thousands of American lives.
And that is the bridge between the old world of empires and the modern geopolitical world we still live in today.
The Cold War shaped the second half of the 20th century. It created the nuclear deterrent, divided nations, and carved up the world into spheres of influence that persist to this day.
Understanding 1870-1945 is essential to understanding the world of 1945-2025—and the world we live in now.
