Three documents such as The Constitution of the United States, Thomas Malthus's Essay on the Principle of Population, and Karl Marx's and Friedrich Engel's Communist Manifesto all possess many similarities, yet there are also differences. The intentions of the authors are similar, due to the times these documents were written, and the historical contexts are a reflection of their worlds around them. Plus, these three documents had great impacts on many audiences and are even talked about in the Twentieth Century. One similarity between these three documents is that they were written during times of revolution and reform. The Constitution was written in 1787, and the writers of the Constitution "were determined to end the period of economic depression, social uncertainty, and very weak central government that had followed independence" (McKay, 695). After the American Revolution, the Declaration of Independence and the Bill of Rights were written. These two documents were the basis of this constitution, and its purpose was to develop a working government and help rebuild their "new" nation. "In 1798, Thomas Malthus advanced a revolutionary theory" (Beatty/Johnson, 149). Malthus's spent most of time on demographic research, which is the basis of his arguments in his Essay on the Principle of Population. He felt that the population would eventually grow beyond the natural resources prepared for it. The basis of his predictions was the "population explosion"(McKay, 637) in the eighteenth century. Also, during this time there were a lot of revolutions and national wars, some were disputes for the gain of more natural resources. These wars were an influence on Malthus. Karl Marx and Friedrich Engels wrote the Communist Manifesto in 1848, and it is considered "one of the greatest revolutionary documents"(Beatty/Johnson, 174). Marx and Friedrich wanted to push the proletarians toward revolution against the bourgeoisie.