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World War I was a global war conflict centered in Europe that began on July 28, 1914 and lasted until November 11, 1918. The war involved the great powers of the whole world, who organized themselves into two opposing alliances: the Allies (based on the Triple Entente between Britain, France, and Russia) and the Central Empires (Germany and Austria-Hungary). Originally the Triple Alliance was formed by Germany, Austria-Hungary and Italy.
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In the period between 1905 and 1914, there were several diplomatic incidents, which contributed to shake the relationship between the European countries, culminating in the assassination of Archduke Franz Ferdinand, possible heir to the Austro-Hungarian Empire. The incident, which took place in Sarajevo, the Bosnian capital, was perpetrated by a Serbian activist, Gravilo Princip.
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The Union of Soviet Socialist Republics ,was a socialist state located in northern Eurasia that stretched from the Baltic and Black seas to the Pacific Ocean .The Soviet Union had its roots in the Russian Revolution of 1917, which overthrew the imperial autocracy. After the revolt, the Bolsheviks, led by Vladimir Lenin, overthrew the provisional government that had been established. The Russian Soviet Federative Socialist Republic was then created and the Russian Civil War .
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The end of the WWI plunged Europe into a chaotic state, as not only some of the most powerful empires were destroyed, the USA would become one of the largest creditors of the rest of the Allied nations, once the previous claims requested from Paris and London had been exhausted. It provided a great primacy to the emerging nation and caused the European powers to become increasingly dependent on the USA, since the latter became the main source of war equipment, reaching a high level of production
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The Spanish flu, also known as the 1918 flu, was a vast and deadly influenza virus pandemic. From January 1918 to December 1920, it infected an estimated 500 million people, about a quarter of the world's population at the time. The death toll is estimated to be between 17 million and 50 million, and possibly as many as 100 million, making it one of the deadliest epidemics in human history.
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The Treaty of Versailles was a peace treaty signed by the European powers that officially ended World War I. The treaty required Germany to accept all responsibility for causing the war .
The terms imposed on Germany included the loss of a part of its territory to a number of frontier nations, of all the colonies over the oceans and on the African continent, a restriction on the size of the army, and compensation for the losses caused during the war. -
The Great Depression, also known as the Crisis of 1929, was the largest financial crisis in the history of the United States, which began in 1929 and persisted throughout the 1930s, ending only with World War II. This period of economic depression caused high unemployment rates, drastic falls in the gross domestic product of several countries, as well as drastic falls in industrial production, stock prices, and virtually every gauge of economic activity, in several countries around the world.
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The New Deal was a series of programs implemented in the United States between 1933 and 1937, under President Franklin Delano Roosevelt, aimed at recovering and reforming the U.S. economy, as well as assisting those harmed by the Great Depression. Its name was inspired by Square Deal, the name given by Theodore Roosevelt to his economic policy.
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In 1936, Hitler broke the Treaty of Versailles by moving 22,000 troops to the demilitarized zone in the Rhineland. Hitler also broke the Treaty of Versailles in 1938 by invading Austria and declaring Anschluss. After Nazi Germany attacking Poland the Allies of WWII, called the "United Nations" from the declaration of January 1, 1942, were the countries that opposed the Axis Powers during WWII . The Allies promoted the alliance as a means of controlling German, Japanese, and Italian aggression.
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World War II was a global military conflict that lasted from 1939 to 1945, involving most of the nations of the world—including all the great powers—organized into two opposing military alliances: the Allies and the Axis. It was the most comprehensive war in history, with more than 100 million military personnel mobilized.