The answer is: A high demand for cotton.
Emperor Meiji finally achieved to get over the ancient and previous traditions of Shogun Lords, which lasted almost 800 years. With, the Meiji restoration, the country formerly established relations with powers in Europe, the United States, and other parts of the world. This became key "in putting Japan into the scene", in the international community. The ancient practices were not fostered anymore (based on Cultural and social distinctions ). It can be said that the nation had formerly consisted of huge differences to be considered relating what people have as an office, the status they served, etc.
So Japan finally entered the modern world, after a long series of wars that were targeted to maintaining the cultural unity and a policy of isolationism that also resulted in upgrading and incorporating changes in Japan foreign policy and structure of the military.
Oliver Cromwell - leader of the round heads in the civil war :)
The correct order is:
3. A system of social classes based on birth evolved;
1. Castes are rigid and inflexible; people are born into a caste and cannot leave it;
4. Castes are a prominent part of people's lives, but people may have been able to move around;
2. Discrimination based on caste is determined to be illegal;
The caste system is a system with very long history, and it has been part of the Indian culture for centuries. At the begging, when it was implemented into the society, the caste system was very rigid and strict, and people were destined from birth to a certain social status for the rest of their lives. This lasted for a very long period of time. In the past century, the caste system started to be a bit more flexible, so certain individuals that showed greater qualities were able to progress into the caste system. And recently, the caste system, and discrimination based on it, have been made illegal in the country, so officially it has come to an end.