What provoked England and France to declare war on Germany in 1939?

Who were the leaders at the Paris peace conferance? What were the rulers of early China called? Why do countries build an empire? What is an example of how the European nations were affected by the treaties ended world war? What are the most important of the consequences of World War 1? What important things happened in 1762? What were the major exploration accomplishments of France? How did the Columbian exchange change both Europe and the Americas? What is the name of a Thick haze of smoke and chemicals? What did king ezana do? How many people of the british died in world war 1? What is a sloping passage through which things can be dropped? What is the basic hand signals in basketball? Who is the most notable and smartest person in the past? What were the injustices Jewish people faced in world war 2? What steps did Thailand take to preserve its independence? Did World War 2 change anything? What are tributes? To create a trail where there was none before? Why are Stacey and Cassie allowed to go to Strawberry?