invasion of Poland
The effect was that Germany attakes France which is an ally of US and Britain, Britain was brought into war and Germans destroyed France almost completely
Napoleon's conquests in Europe brought Britain, as well as Austria, Russia and many other countries, into war with France.
Both World War I, and World War 2, brought France and Great Britain closer as allies, to fight the German Kaiser (WW I) and Hitler and Nazis Germany (WW II).
Germans alliance with Britain
what caused the war of France and britain
Austria wanted to crush Serbia and they brought France Germany Russia and Britain into the war
France and Britain were on the same side.
The main major event that got Britain and France involved in WWII was the invasion of Poland by the Nazis. The three countries, Britain, France, and Poland had an agreement that if any one of them was invaded the other two would attack Germany.
Britain and France declared war on Germany on 3 September 1939
June 10th, 1940, Italy declared war on Britain and France
Britain and France were not involved in the American Civil War. The Confederacy asked for Britain's help but they did not get involved.