Because of geography.
There are many parts of Europe that are developed. You may be thinking in terms of western Europe being more developed that eastern Europe, but it would not be true to say that eastern Europe is not developed.
Europe has many different languages in the different countries.
Eastern Europe is a region which contains twenty-seven countries. Slovenia is the most developed of these nations, being the thirteenth most developed European nation and the twentieth most developed nation in the world overall. Moldova is the least developed of these nations, and is the one hundred and eleventh most developed country in the world. Overall, Eastern Europe is actually pretty developed compared to the rest of the world. But compared to its counterpart, Western Europe, it is underdeveloped. Eastern Europe is still considered a developing region.
because they have many other resources
Quilted bedding was not necessarily "introduced" to Europe. The technique of sewing together two or more layers of cloth with some sort of filling to provide padding or warmth probably developed independently in many different geographic locations at different times in history and prehistory.
Europe is not a country, it is a continent. It has many countries in it. Most of the countries of Europe are well developed. Most of them have had wealth and technology which has helped them to develop.
Because there are so many different ethnic groups in Europe. Basically, each major ethnic group has their own country and language in Europe.
There have been many many many revolts everywhere in Europe in many different times. You are going to have to be more specific.
Europe is composed of many different countries and many different currencies, the most used is the Euro, the official currency of the European Union.
Europe is composed of many different countries and many different currencies, the most used is the Euro, the official currency of the European Union.
Many different experiments are performed and repeated.
Europe is a continent and has many countries, so there were many different currencies used in Europe in 1918, just as there is today.