Czechs from the Kingdom of Bohemia invited many Germans to help them to work on their land and mines. These Germans were later called Sudeten Germans and developed their very own advanced culture. 

The Kingdom of Bohemia passed into the hands of Germans kings of the Holy Roman-German Empire, a situation that lasted until 1806.

The Bohemian region became part of the Austro-Hungarian Empire until 1918. It was during this period that the Sudeten Germans emigrated freely to the Brazilian Empire.

In 1918, after the First World War, the Czechoslovak Republic was created.

After 700 years, the peaceful coexistence between the Slavic Czechs and the Sudeten Germans deteriorated due to the fact the Czechs wanted to recover their language and land. With the independence in 1918, the Czech President Dr. Benesch initiated a hostile policy towards the Sudeten Germans. 

Hitler annexed the Bohemian region to the Third Reich, with the support of the Sudeten Germans.  

 Shortly after the end of the war, all the Sudeten-German people had their citizenship revoked, their properties confiscated and were expelled from Bohemia, their land. About three million Sudeten Germans people fled, some with nothing but the clothes on their backs, some belongings and documents, and 240,000 others succumbed.

The Bavarian Government declared the Sudeten Germans a 'Bavarian Ethnic Group' being, therefore, Austrians and also Bavarians, while Bohemians and Czechs.

Czechoslovakia was divided into Czech Republic and Slovakia.

After many negotiations, German Chancellor Helmut Kohl and Czech President Vaclav Havel signed the "Declaration of Reconciliation" on 21 January 1997.

Since August 2007, united by history, Nova Petrópolis has been a sister city to Jablonec, located in the Czech Republic.