These states eventually formed into modern Germany in the 19th century .
Originally part of the Holy Roman Empire , around 300 independent German states emerged during its decline after the Peace of Westphalia in 1648 ending the Thirty Years War .
These states eventually formed into modern German in the 19th century .
Originally part of the Holy Roman Empire , around 300 independent German states emerged during its decline after the Peace of Westphalia in 1648 ending the Thirty Years War .