Human rights are conceived as universal entitlements that all humans possess merely due to being human. However, there is no consensus on what specifically should be considered a human right. The concept of rights has existed throughout history but the modern notion of universal human rights first emerged in Europe in the 16th century through documents like the Twelve Articles. Major developments in the 18th and 19th centuries like the US Declaration of Independence established certain legal rights, and the abolition of slavery movement helped make human rights a central concern. The World Wars drove the development of modern human rights instruments and bodies like the UN to protect rights.