Name of Mexico an autonomous constitutional monarchy under an independence hero. Agustín was crowned and given the titles of: Agustin de Iturbide por la divina providencia y por el Congreso de la Nación, primer Emperador Constitucional de Mexico (Agustín de Iurbide First Constitutional Emperor of Mexico by Divine Providence and by the Congress of the Nation). The name chosen for the country was "Imperio Mexicano", "Mexican Empire". The empire collapsed in 1823, and the republican forces drafted a constitution the following year whereby a federal form of government was instituted. In the 1824 constitution, which gave rise to the Mexican federation, "Estados Unidos
What Is and What Should Never Be and What Should Never Be" was performed live at Led Zeppelin concerts between 1969 and 1973. A live version taken from a performance at the Royal Albert Hall in 1970 can be seen on the "Led Zeppelin DVD". Another was included on disc two of the live triple album "How The West Was Won". Two more versions were included in BBC Sessions. What Is and What Should Never Be "What Is and What Should Never Be" is a song by English rock band Led Zeppelin. It was written by Jimmy Page and Robert Plant and was included as the second