The Constitution of Belgium dates back to 1831. Since then Belgium has been a parliamentary monarchy that applies the principles of ministerial responsibility for the government policy and the Trias Politica. The Constitution established Belgium as a centralised unitary state.

Although Belgium has only been an independent state since the 1830s, it has a long and complex past. This history is essential for understanding the complexities of issues that led to a devolution of the unitary Belgian state into a federation of linguistically based regions. In addition to the elements that contributed to Belgium's particular political evolution, the history which is traced in this book is a composite of many themes of broad historical interest and importance. Belgium: A History covers the gamut of Belgian history through dramas of religious and cultural conflict, intense localism, state building, uneven development, divergent class interests, war and domination, and finally, integration into a larger European community.