What are the common features of the European states in the interwar period?

In the interwar period, many European countries became independent states. In most countries, a cultural dawn is celebrated: talented artists and writers appear, new trends are also emerging in architecture and arts and crafts, for example, Art Deco. By the end of 1920, the Great Depression begins. This was facilitated by the global economic crisis that began in the United States and then manifested itself in many countries of the world.