The Constitution Day is coming!

Spain celebrates the Constitution day on the 6th of December...but...What is a constitution? What values does the constitution transmit? Have you read it? Here you can do it in English!!!! http://www.congreso.es/portal/page/portal/Congreso/Congreso/Hist_Normas/Norm/const_espa_texto_ingles_0.pdf Spain has also celebrated the signing of previous constitution: the constitution of 1812, that is, la Pepa. Do you know why it´s called that way? What did it imply? In what historical context was it signed? Do you know of other constitutions? Does the U.K. have a constitution? And the U.S.?