History and Development of Political and Legal Institutions of European Union

Introduction
The European Union is a unique economic and political partnership between 28 European countries that together cover much of the continent, created in the aftermath of the Second World War. The EU traces its origins from the European Coal and Steel Community (ECSC) and the European Economic Community (EEC), formed by the inner six countries in 1951 and 1958, respectively.
Through successive enlargements, the Union has grown from the six founding states—Belgium, France, West Germany, Italy, Luxembourg, and the Netherlands—to the current 28. It took around 60 years from the Treaty of Brussels, 1948, to the Treaty of Lisbon, 2009, to get its final form.
In 1993, under Maastricht Treaty the name European Economic Community was changed to European Union, which reflects the evolution of an economic union to an organization standardizing system of law to maintain common policies on trade, agriculture, fisheries and regional development. Human dignity, freedom, democracy, equality, the rule of law and respect for human rights: these are the core values of the EU.
During the formation and development of European Union the number, structure, cross-link and interdependency of institutions and other bodies increased (Figure 1). In our work we will explain the history and development of political and legal institutions of European Union.

Figure 1, Power structure of main political and legal institutions of European Union .

European Parliament
The predecessor of the Parliament as we know it today was the Common Assembly of the European Coal and Steel Community (ECSC). It was made up of 78 representatives of the national parliaments, but only had a supervisory power over the ECSC.
In 1957, the member states of the ECSC decided to go one step further and create a European