The reasons are mainly greed and the want of power by religious and economic powers.
Usa due to the Treaty of Versailles
to preserve power
other countries had to recover from the effects of the first World War and the US was hardly effected by it.
Until WWI the world's leading economic power was Great Britain. Her position was maintained through her empire and the world's largest and most powerful navy of the day. The United States was practising a policy of isolation and was not interested in foreign wars and at that time had little or no colonial interests. Other colonial powers at the time were France, Holland, Portugal and Germany but even combined they could not compare to the industrial, economic or military might of the British Empire. As a result of the war Great Britain was economically and militarily weakened and her colonies began campaigning and fighting for independence. This was a slow process that in some cases dragged on until the 1950s and beyond. The result of the decline of the Great Britain and her Empire as an economic power led to led to power vacuums both economically and militarily. These vacuums were filled by the USA and (at least for the period between the two world wars) Germany and Japan.
World War 1 change economic power the right way
World War 1 change economic power the right way
World War 1 change economic power the right way
World War 1 change economic power the right way
World War 1 change economic power the right way
After World War I, some of the old powers declined or even ceased to exist, and some new ones arose on the scene. The Habsburg empire practically vanished, being reduced only to Austria. The Ottoman empire was on its knees, and the US emerged as a significant force.
Stephen G. Brooks has written: 'World out of balance' -- subject(s): Globalization, World politics, International relations, Balance of power, Economic aspects, Economic aspects of Globalization, Foreign relations
The Eastern Bloc of EuropeThe Cold War for 50 years
The end of the Revolutionary War brought a change not only to U.S. politics, but a change to the balance of power throughout the world as well. Spain had lost Florida a few years earlier and couldn't regain its status as a superpower. Political power in the colonies after the war shifted to the Quakers who held on to it, trying to influence everything from slavery to foreign policy.
There was not only one power in existence which rules the world. So there is a balance of power.
Change the World Without Taking Power was created in 2002.
Atomic weapons impact the balance of military power in the world today in the sense that produce a sense of fear in the countries that have weak militaries.