Constitutional law prescribes the structures or organs of the state, be it the executive or the government, the legislature as well as the judiciary. It also prescribes the objectives and the constitutional principles as well as the political system in any particular social formation for the purposes of protection of rights. Hence, constitutional law is always regarded as the principal law of the land. Most constitutions are written. I believe only the British constitution is not written.
Constitutions reflect the ideologies of a particular country.
Hence, most constitutions in developing countries are replicas of the constitutions of their masters. Constitutions enshrine fundamental human rights, therefore disability rights denote access to fundamental human rights as we who have disabilities have got to enjoy the same rights as other people. When you look at political systems, from time immemorial, it has been an issue of the majority or democracy. But democracy means different things to different people. It may mean a different thing to a capitalist, to a developing country or a socialist.