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After their defeat at the Battle of Actium, Antony and Cleopatra returned to Alexandria, Egypt. Despite the loss, they attempted to continue their resistance using their remaining troops and finances. However, following the collapse of their fleet at Actium, the situation rapidly deteriorated as soldiers began deserting the army as well. Octavian prepared to march east and attack Egypt the following year. Antony made a final effort to rally his forces and block Octavian's advance, but several allied powers had already abandoned him. In 30 BC, as Octavian's forces approached Alexandria, Antony prepared for a final battle. However, with parts of his army and navy defecting to Octavian, resistance became virtually impossible. Antony, believing he was defeated, committed suicide, and Cleopatra followed soon after. Thus, their combined forces were completely dismantled, and Octavian rose to become the sole supreme ruler of the Roman world.

The decisive moment of the Battle of Actium was when Antony and Cleopatra led their fleet and broke through the battle zone. Cleopatra's Egyptian fleet began to slip south through a gap in the battle lines, and Antony followed suit in his flagship. This action left the rest of their fleet behind on the battlefield. While there are various interpretations as to why Antony personally led the breakout, it's explained that one objective was to preserve some of their fleet to continue the war under the circumstances. However, once their commander left the battlefield, the morale of Antony's remaining forces plummeted. Some ships continued to resist but eventually surrendered or were destroyed by Octavian's forces. Antony's land troops also lost the will to fight as they watched the outcome of the naval battle. Ultimately, the Battle of Actium ended in a decisive victory for Octavian, and Antony and Cleopatra retreated to Egypt.

In 58 BC, the Helvetii decided to leave their homeland and migrate to western Gaul. Caesar blocked their intended route through Roman territory and, after they took an alternative path, pursued and engaged them in battle near Bibracte. The Helvetii were defeated and forced to return to their original lands. Subsequently, Caesar clashed with Ariovistus, leader of the Suebi, who was expanding his influence in eastern Gaul. Ariovistus had been intervening in the internal conflicts of some Gallic tribes, increasing his power, and relations with Rome had deteriorated. Caesar's legions defeated the Suebi near the Vosges Mountains, thereby extending Roman influence west of the Rhine River. These two battles marked the beginning of Caesar's broader involvement in the conflicts among Gallic tribes, expanding his operational scope. However, the Roman advance also heightened the vigilance of the Gallic tribes. Caesar continued his military campaigns, leveraging the alliances and rivalries between the tribes. He justified these actions as necessary measures to ensure the safety of Gaul.

World War II began in Europe in 1939 and ended with Japan's surrender in 1945, leaving behind immense loss of life and economic devastation across many regions of the world. The Axis powers, centered around Germany, Japan, and Italy, were defeated, and the United States and the Soviet Union emerged as key superpowers in the post-war international order. Major European cities and industrial facilities were heavily destroyed, and countless civilians were victimized by war, massacres, and forced displacement. Notably, Nazi Germany carried out systematic persecution and massacres against European Jews and various other groups, resulting in approximately 6 million Jewish deaths during the Holocaust. Following the war, the international community established the United Nations in 1945 to prevent large-scale wars from happening again. Germany was divided and occupied by the Allied powers, and Japan also came under Allied occupation. Meanwhile, the confrontation between the United States and the Soviet Union began, forming a new international order known as the Cold War. Independence movements against colonial rule also became more active in Asia and Africa. World War II was a historical event that significantly altered the politics, economy, international relations, and social structure of the 20th century.

In 1945, the United States demanded Japan's surrender, but the Japanese government did not immediately accept. Anticipating massive casualties from an invasion of the Japanese mainland, the U.S. decided to use a new weapon. On August 6th, the U.S. dropped an atomic bomb on Hiroshima, Japan, causing severe damage to the city. On August 8th, the Soviet Union also declared war on Japan and attacked Japanese forces stationed in Manchuria. The next day, the U.S. dropped a second atomic bomb on Nagasaki. Debates raged within the Japanese government over whether to continue the war or surrender, and Emperor Hirohito ultimately decided to surrender. On August 15th, an announcement of Japan's surrender was broadcast, and on September 2nd, the Instrument of Surrender was formally signed aboard the USS Missouri in Tokyo Bay. This marked the end of major combat operations in World War II. The extent to which the use of atomic bombs and the Soviet Union's entry into the war contributed to Japan's surrender remains a subject of ongoing discussion among historians, and the war's conclusion was a result of a combination of various military and political factors.

Following Midway and Guadalcanal, the United States gradually secured the initiative in the Pacific. Instead of advancing directly to the Japanese mainland, the US military pursued an island-hopping campaign, capturing strategically important islands one by one. This allowed American aircraft and naval vessels to get closer to the Japanese mainland while bypassing key Japanese bases. From 1943 onwards, US forces launched offensives centered around New Guinea, the Solomon Islands, and the Marshall Islands. In 1944, the operation to recapture the Philippines began, and the Japanese navy suffered heavy losses in the Battle of Leyte Gulf. Subsequently, US forces sequentially attacked areas close to the Japanese mainland, including Saipan, Guam, Iwo Jima, and Okinawa. The Japanese military fiercely resisted on each island, resulting in significant casualties for the US forces as well. Particularly in the battles of Iwo Jima and Okinawa, the Japanese forces put up a desperate resistance. The United States intensified bombing raids on the Japanese mainland, causing extensive damage to Japan's industry and cities. The Pacific War was entering its final stages, with the surrender of the Japanese mainland imminent.

In the spring of 1945, the Allied forces launched their final offensive into mainland Germany. In the west, American and British troops crossed the Rhine and advanced into Germany, while in the east, Soviet forces approached Berlin. The German army was short on troops and equipment, and its cities and industrial facilities had suffered heavy damage from Allied bombing. When Soviet troops reached the outskirts of Berlin in April, urban warfare began. Hitler attempted to command the war from his underground bunker until the very end, but he could not prevent Germany's defeat. Hitler committed suicide on April 30th, and German resistance in Berlin rapidly weakened. The Berlin garrison surrendered on May 2nd, followed by the surrender of major German army units. Germany's new government negotiated surrender terms with the Allies and signed the surrender document on May 7th. On May 8th, Germany's unconditional surrender took effect in Europe, ending the war in Europe. However, the war with Japan continued in the Pacific.

On the Eastern Front, the Soviet Union's large-scale counteroffensive continued. In 1944, the Soviets launched Operation Bagration in Belarus, inflicting heavy losses on the German Army Group Center. The German forces lost numerous troops and equipment, retreating westward. The Soviet army advanced through Poland and the Baltic region, approaching the German border. Germany's allies, such as Romania and Bulgaria, successively withdrew from the war or switched to the Allied side. In Hungary, German forces strengthened their defenses, but struggled to halt the Soviet advance. In early 1945, the Soviets crossed the Vistula River and launched a massive offensive towards German territory. Germany concentrated its forces on the Eastern Front, but already lacked sufficient resources to continue the war. As the Soviet army pushed towards Berlin, they seized key German industrial areas and transportation networks. With most of Eastern Europe falling under Soviet influence, the post-war political order of Europe underwent significant changes. Germany now faced the challenge of defending its capital from attacks on both its western and eastern fronts.

Following the Normandy landings, the Allied forces rapidly advanced inland into France. German forces resisted in various areas, but struggled to cope with the overwhelming Allied air power and supply capabilities. In August 1944, the Allies entered Paris, and the French Resistance and Free French forces also rose up against the German army. The Germans retreated from Paris, and the French Provisional Government led by Charles de Gaulle returned to the capital. Simultaneously, on the Eastern Front, Soviet forces launched a large-scale offensive, pushing German troops towards Poland and Eastern Europe. Germany found itself under pressure from both the west and the east. The Allies advanced towards Belgium and the Netherlands, approaching the German border. The German army prepared for a final counteroffensive, but faced severe shortages in manpower, fuel, and aircraft. In late 1944, Germany launched the Ardennes Offensive on the Western Front, surprising the Allied forces, but it failed to change the long-term tide of the war. The German defensive lines gradually crumbled, and the war began to move towards mainland Germany.

On June 6, 1944, Allied forces landed a massive number of troops on the coast of Normandy, northern France. Commanded by Eisenhower, the Allies attacked German defenses with thousands of ships and aircraft. Airborne troops were deployed behind enemy lines first, followed by American, British, and Canadian forces landing at various points along the coast. Despite fierce German resistance, the Allies succeeded in securing a beachhead. Subsequently, with continuous reinforcement of troops and equipment, the Allied forces advanced inland into France. Paris was liberated in August, and German forces rapidly retreated from France. The Normandy landings opened a new front in Western Europe, forcing the German army to fight on both the Eastern and Western fronts simultaneously. The Allies began their advance towards the German border, starting with the liberation of France, and Germany's chances of defeat grew significantly. This operation is recorded as one of the largest amphibious assaults in World War II and became a crucial turning point in the liberation of Europe.