Meaning of "When France sneezes, the rest of Europe catches a cold."
"When France sneezes, the rest of Europe catches a cold." is a statement by Metternich to state the influence of France on other European nations. France was going through a lot of political changes. In July 1830, the first upheaval took place in France. At this time, the Bourbon Kings were overthrown, and the power was shifted into the hands of liberal revolutionaries. These liberal revolutionaries established the constitutional monarchy, and the head of this monarchy was Louis Philippe.
Influenced by the July revolution, there was a spark in the uprising in Brussels. Brussels took it to Belgium and broke away from the Netherlands' the United Kingdom. A lot of similar incidents happened in other European Nations. Seeing the influence of France on these countries, the statement "When France sneezes, the rest of Europe catches a cold." was quoted.