Answer:
I think its D goverment if its wrong im sorry but its the only one that seems like it makes since
Explanation:
song dynasty in china had two parts: first part was the "north song" dynasty. it ruled most of china n time was good. it followed long time of civil wars n ppl were tired of wars. so the emperor consolidated his power n ruled over a large n stable empire.
but it grew weak n was attacked by enemies from north. it lost most of its northern territories n ruled only southern china. it was called the "south song" dynasty. due to limited resources, time was tough. it had to maintain a large army to protect against the north which required heavy taxation of ppl.
I'm pretty sure it was the horse bc native americans no longer traveled on foot for long distances. instead, they had the ability to travel using horses which was faster and more efficient
