What was the impact of France on Germany before 1815?

Beginning in January 1798, Revolutionary France under
Napoleon Bonaparte (1769-1821) had invaded the left bank of the Rhine and into the Holy
Roman Empire, merely a section of conflict that has become known as the Napoleonic Wars,
in which France became the dominant continental European power, either directly or
indirectly controlling Spain, The Netherlands, and sections of what is currently Italy
and Germany. In 1803, after Great Britain had declared war on France, Napoleon invaded
Central Europe (Germany) including the city of Hanover in Saxony, a possession of King
George III of England. In 1806, while dismantling the remnants of the Holy Roman Empire,
he created created the Duchy of Warsaw and partitioned Prussia. By introducing the
Continental System throughout most of Europe, he demolished the long-standing
city-states and small regional governments while strengthening the central government.
The strong feeling of nationalism that was put into practice in the early 1800's led to
the creation of the German nation in the latter 1800's.