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Invention of airships.
In 1900, German military officer, Ferdinand Zeppelin invented a rigid framed dirigible or airship that became known as the Zeppelin. Zeppelin flew the world's first untethered rigid airship, the LZ-1, on July 2, 1900, near Lake Constance in Germany, carrying five passengers -
The theory of relativity
Albert Einstein determined that the laws of physics are the same for all observers, and that the speed of light in a vacuum was independent of the motion of all observers. This was the theory of special relativity -
World War I
The assassination of Austrian Archduke Franz Ferdinand on 28 June 1914 set off a chain of events that led to war in early August 1914. The assassination was traced to a Serbian extremist group that wanted to increase Serbian power in the Balkans by breaking up the Austro-Hungarian Empire. -
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globalization in the 20th century
It refers to the extension beyond national borders of the same market forces that for centuries have operated at all levels of human economic activity: in rural markets, urban industries or financial centers. -
World War 2
The immediate precipitating event was the invasion of Poland by Nazi Germany on September 1, 1939, and the subsequent declarations of war on Germany made by Britain and France, but many other prior events have been suggested as ultimate causes. -
Nuclear or atomic energy.
nuclear energy, energy that is released in significant amounts in processes that affect atomic nuclei, the dense cores of atoms. It is distinct from the energy of other atomic phenomena such as ordinary chemical reactions, which involve only the orbital electrons of atoms. -
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decolonization in the 20th century
Decolonization was the process of independence of colonies from their European metropolises. It emerged in Africa and Asia in the mid-20th century and claims the right of self-determination of the colonized peoples. -
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The Cold War
The Cold War was a period marked by a political-ideological conflict between the United States and the former Soviet Union (USSR) between 1947 and 1991. This period of time polarized the world into two large blocs, one aligned with capitalism and the other with communism. -
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women's liberation
The women's liberation movement (WLM) was a political alignment of women and feminist intellectualism that emerged in the late 1960s and continued into the 1980s primarily in the industrialized nations of the Western world, which effected great change (political, intellectual, cultural) throughout the world. -
the Watergate scandal
The scandal included a break-in at the Democratic National Committee (DNC) headquarters in the Watergate complex in Washington, D.C., on June 17, 1972, and subsequent cover-up by people who worked for or with the White House, and by Nixon himself.