1.) What happened or what was the aim of each of the 4 congress sessions?
2.) What led to rise of nationalism in India and in Europe?
3.) What is the latest (2016) per capita income to classify countries?

It is convened to pass a law. People's spring and anti-British mood. Gross national income varies and depends on the economy of one country.

Explanation:

A parliamentary session is a period in which parliament is convened to pass a law. In each country, the procedures for opening, ending, and between sessions vary slightly. Depending on the need, a meeting is convened, and its duration depends on the problem on the plan or the time frame needed to resolve it. The legislative session ended with an official act of prorogation.The rise of nationalism began in the spring of 1848. Nationalism is a doctrine that invites members of a nation to unite within a specific national framework to protect common interests. These interests generally involve nurturing common historical and cultural values, adherence to tradition, and sometimes to a particular political ideal. Some countries, such as Germany and Italy, have emerged from the unification of different regional states with a collective "national identity." Others, such as Greece, Serbia, Poland, Romania, and Bulgaria, revolted against the Ottoman Empire and the Russian Empire. The political unification of India is linked to several factors. The decline of the old Indian social and economic system was one of the factors that contributed to the unification. Industrial flows, the emergence of modern trends, and the effort to resist the state by British colonial rule led to the birth of Indian nationalism.Gross national order depends as previously emphasized on the economy of the country itself. Every July of the year, an analyst assessment is conducted on a worldwide basis. According to available data for 2016, $ 1,025 national income was for lower-middle-income economies. Upper middle-income economies vary in scale from 1,026 to 4,035. High-income economies are $ 12,476 or more. Updated per capital income estimates are also used as input to World Bank operational guidelines that determine eligibility for credit.