The Swiss constitution can be re-written completely…
1864 CE to 1875 CE
This need soon proves itself when the rise in population and the Industrial Revolution that follows lead to calls to modify the constitution accordingly.
An early draft is rejected by the population in 1872 but modifications lead to its acceptance in 1874.
It introduces the facultative referendum for laws at the federal level.
It also establishes federal responsibility for defense, trade, and legal matters.