Ch. 5.6 Global Dominance Of English
a language of international immunization is known as Lingua Franca. Other contemporary lingua franca languages include Swahili in East Africa, Hindi in South Asia, Indonesia in Southeast Asia, and Russian in the Soviet Union.
Global Distribution of English
Through out the world 55 countries use English as their official language. The spread was naturally caused by the diffusion of migration, such as when England migrated west to America.
What is a "Lingua Franca"? (Quick Video)
Why has English developed as a world language? - YouTube