What effects does labor migration have on the world as a whole?

Explaining how did leopold's aggression promote western imperialism in africa?

Historians are concerned with the accuracy of their writings and readings but are also aware of the inability of authors to know every angle of every story biases, perspectives, beliefs, and a variety of other differences history being told by one person at a time no one being totally accurate, as hard as we try really need on this, and you^^

Name three new weapons that changed how ww! was fought and how?