Answer: drought making he soil less compact
Explanations
The farmers keep growing the same crops, the crops the were growing were making the soil weak.
London was not a departure point for Great B
Since you did not provide the options in your question, I had to do some looking around, but I believe I have found them. I will mark what I believe are the answers by italicising and bolding them.
<em>Most countries are increasingly specializing production.</em>
<em>Most countries are becoming more interdependent.</em>
Most countries are experiencing unchanging amounts of exports and imports.
<em>Most countries are increasingly influenced more on the foreign sector.</em>
Most countries are relying less and less on international trade.
Hopefully this gives you some help.
Answer:
A Dakota leader led hundreds of warriors in an uprising and Dakota attacks killed more than 400 people in Minnesota.
Explanation: