The use of new methodologies for demographic investigations in national-territorial subdivisions of Russia

In the experiment the most important events in the development of ethnic and demographic population of the Republic of Tatarstan in the XX century are analyzed. The dynamics of Russian and Tatar population of the total population of the Republic of Tatarstan for 1920-2010 years is given in the article. Historical events that may affect the dynamics causes imbalance demographic processes are analyzed. The technique is primarily designed to clarify the practice of forecasting population in the national- territorial formations Russia. For practical application another technique is created which allows to assess the impact of ethnicity and national migration in the formation and development of the demographic potential of the region. In particular, all major nationalities living in Russia, based on the mode of their demographic development, migration activity and inertial features of demographic processes are divided into five groups. Using this technique we can distinguish four groups that composed 11 nationalities in the Republic of Tatarstan