After the fall of the Roman Empire, what caused the system of feudalism develop in Western Europe?

During the late 19th century, russia's settlement and development of siberia was made possible by the invention of the

What caused the settlement of more african americans in the mississippi alluvial plain region then in the ozark mountains region?

In e. c. tolman's experiment, some rats were trained to run through mazes for standard food goals, while other rats were allowed to explore the mazes for 10 days without food goals or other rewards. later, when food rewards were placed in a box at the far end of the maze, the previously unrewarded rats reached the food box as quickly as the rewarded rats after only one or two trials. this experiment demonstrated that the rats had the ability to form of their surroundings.