I believe it was the spread of Christianity although increase trade was amazing. The Chinese did not want the spread of Christianity and was mostly a traditional area.
Early 1800's. The Erie Canal was built in 1817
I think it’s less than 10% of rain
<span>The ecological pyramid is the smallest at the top beacuse there is ten percent loss of energy, in the form of food, at each trophic level, and the number of organisms of the top most level are the fewest. </span>