Answer:
The answer to my knowledge is A.
Step-by-step explanation:
One of the biggest aspect looking back in the day was LAND obtaining more and more land over the years expanding the 13 colonies and boarders. As well as Hundreds of other events that went down in history
Over the years I've never heard of migration caused by animals ever.
Soil is moved closer to water.
and markets just doesn't seem right (what markets)