Brownfields are old, unused sites and buildings located in urban areas and open countryside. This article deals with problems of brownfields that developed as a result of restructuring national industry, a decreased significance of primary and secondary industry, and the increase of tertiary...

Federation is one type of state characterised by a contractual and constitutional structure, multilevel power redistribution, a written constitution, and duality of power. Federalism is a philosophy and a political instrument enabling a federation to function. The principle of federalism is an...