Final answer:
Argentina's utilization of sports like soccer and polo, along with the cultural dance of tango, contributed to the creation of a shared national identity and cultural assimilation among immigrants, fostering unity within the country.
Step-by-step explanation:
The concept demonstrated by the way Argentina used soccer, polo, and the tango to unite different groups of immigrants is the creation of a new national identity or cultural assimilation. By participating in these popular national pastimes, immigrants in Argentina began to identify with each other and the country, fostering a sense of belonging and unity that transcended their diverse origins. This process formed a unique Argentine culture that blended Old World European customs with New World Latin American traditions, as seen in the cosmopolitan city of Buenos Aires. Social cohesion and the development of a shared national identity have been crucial for Argentina, especially as the country faced periods of political instability and changes in its demographic makeup. The involvement in national sports and dance provided a unifying force, propelling the country towards a more integrated society.