Important Historical Events

Ottoman control over Constantinople pushed Europe to search for new sea routes. Exam tip: remember 1453.

The Ninety Five Theses accelerated debate on church reform in Europe. Exam tip: remember 1517.

Westphalia strengthened the modern system of sovereign states. Exam tip: connect it with the end of the Thirty Years War.

The Glorious Revolution strengthened Parliament and law based monarchy. Exam tip: remember the Bill of Rights.

Ideas of rights and consent of the people were important in the American Revolution. Exam tip: remember the Declaration of Independence.

The French Revolution challenged privilege and absolute monarchy. Exam tip: remember liberty equality fraternity.

The Haitian Revolution challenged slavery and colonial rule. Exam tip: remember Toussaint Louverture.

The Congress of Vienna tried to bring stability to Europe after Napoleon. Exam tip: remember balance of power.

The Industrial Revolution rapidly increased the use of factories and machines. Exam tip: remember steam engine and urbanization.

The Opium Wars weakened China's sovereignty and trade control. Exam tip: remember the Treaty of Nanking.

The Meiji Restoration made Japan a modern military and industrial power. Exam tip: remember nineteenth century Japan.

The Berlin Conference was linked with the Scramble for Africa. Exam tip: connect it with colonial partition.

Japan's victory indicated the rise of a new power in Asia. Exam tip: remember 1904 to 1905.

Nationalism militarism imperialism and alliances created the background of the war. Exam tip: separate these from the immediate cause.

The harsh terms of Versailles increased German resentment. Exam tip: remember war guilt and reparations.

After the Russian Revolution the Soviet state emerged and communism influenced global politics. Exam tip: remember 1917.

The Great Depression increased unemployment economic crisis and political instability. Exam tip: remember the New Deal and rise of fascism.

The invasion of Poland was decisive because it turned the European crisis into an open international war. Germany attacked Poland on 1 September 1939, using force to expand its territory. Britain and France had promised support to Poland and, after the attack, declared war on Germany. This made the conflict much wider than a dispute between Germany and Poland. Therefore, option A is correct. The other choices describe unrelated events: the United Nations did not end, the French Revolution had occurred much earlier, and America had become independent in the eighteenth century.

Remember that the invasion itself did not mean that every country immediately joined the war, but it was the direct trigger for the declarations by Britain and France. It is commonly treated as the beginning of the Second World War in Europe. The date 1939 is useful for examination revision. The key chain is: German invasion of Poland, British and French declarations of war, and the expansion of the conflict into World War II. Thus the supplied answer is accurate.

Japan attacked the US naval base at Pearl Harbor on 7 December 1941. The attack led the United States to declare war on Japan and enter the Second World War as an active belligerent; Germany and Italy then declared war on the USA. Thus A is correct. The Renaissance and Mongol Empire belong to much earlier periods, while the Russo-Japanese War ended in 1905, long before Pearl Harbor.

D-Day refers to the Allied landing in Normandy, France, on 6 June 1944, during the Second World War. The operation opened a major western front against Nazi Germany. By establishing beachheads and bringing large numbers of troops and supplies into occupied France, the Allies began a sustained advance across Western Europe. This helped liberate France and other territories and placed increasing military pressure on Germany from the west, while the Soviet Union fought on the eastern front. Therefore option A is correct. The other choices concern unrelated developments: German reunification came in 1990, the Chinese republican revolution belonged to a different context, and African decolonisation occurred mainly after the war.