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What is a cold war ?

a state of political hostility between countries characterized by threats, propaganda, and other measures short of open warfare, in particular.

Source : Wikipedia 

Hot War-Cold War-Holocaust

Causes of Cold War :

In A Nutshell

The Cold War, a hostile rivalry between the United States and the Soviet Union, lasted from the late 1940s until the collapse of the Soviet Union in 1991. The war was "cold" only in that the United States and USSR never fought each other in a direct military confrontation, but both superpowers threatened each other with nuclear annihilation and participated frequently in "proxy wars" by supporting allied nations in numerous "hot" wars in places like Korean, Vietnam), and Angola. The Cold War defined both countries' foreign policies through the second half of the twentieth century, as Americans and Soviets competed for allies to maintain and widen their respective spheres of influence around the world. Each side viewed the Cold War as a battle between civilizations; in the worldwide clash between American capitalism and Soviet Communism, only one could prevail. For more than forty years, the Soviet-American conflict hung heavy over global affairs, shaping the world with massive military buildups, a never-ending nuclear arms race, intensive espionage, and fierce technological competition as each side tried to gain the upper hand in preparation for thethermonuclear "hot war" all humans feared would someday come.

Source : http://www.shmoop.com/causes-of-cold-war/

Research about dreadnoughts

The dreadnought was the predominant type of battleship in the early 20th century. The first of the kind, the Royal Navy'sDreadnought, made such a strong impression on people's minds when it was launched in 1906 that similar battleships built subsequently were referred to generically as "dreadnoughts", and earlier battleships became known as pre-dreadnoughts. The Dreadnought's design had two revolutionary features: an "all-big-gun" armament scheme, with an unprecedented number of heavy-calibre guns, and steam turbine propulsion.^[a] As dreadnoughts became a crucial symbol of national power, the arrival of these new warships renewed the naval arms race between the United Kingdom and Germany. Dreadnought races sprang up around the world, including in South America, lasting up to the beginning of World War I. Successive designs increased rapidly in size and made use of improvements in armament, armor, and propulsion throughout the dreadnought era. Within five years, new battleships had outclassed Dreadnought itself. These more powerful vessels were known as "super-dreadnoughts". Most of the original dreadnoughts were scrapped after the end of World War I under the terms of the Washington Naval Treaty, but many of the newer super-dreadnoughts continued to be used throughout World War II.

While dreadnought-building consumed vast resources in the early 20th century, there was only one battle between large dreadnought fleets. At the Battle of Jutland, the British and German navies clashed with no decisive result. The term "dreadnought" gradually dropped from use after World War I, especially after the Washington Naval Treaty, as virtually all remaining battleships shared dreadnought characteristics; the term can also be used to describe battlecruisers, the other type of ship resulting from the dreadnought revolution.

-Source Wikipedia 

Pictures of dreadnaought