How did nationalism impact ethnic and cultural identity on a global scale?

Why was control of the atlantic ocean essential to great britain’s success in world war 2

The devahrime system was created in order to : a. promote the expansion of sikhism in the ottoman empire b. illuminate the influence of christianity in the ottoman empire c. create trade relationships between the ottoman and mughal empires d. provide the ottoman empire with trained professional soldiers

Who was a 1920s film star who was the first male "heart throb" in film.