That would be D slave trading
Monroe doctrine was the thing that blocked other nations from coming into americas. It was enforced by the british military who were the strongest at time.
Many nations accepted this out of fear of their military.
Upper Mantle layer is what produces magma that causes sea floor spreading and volcanoes. :)
Answer:
The evidence of zebra crossing and pedestrian walks are not available
To support your answer and give you credit when your teacher is grading your work.
