Why did no great empires develop to the north of mesoamerica?

Select all that apply. the tang dynasty interacted with foreigners by: a letting them buy property in china. b accusing them of corruption and the downfall of the dynasty. c trading with them, especially japan and korea. d teaching them to become monks. e attacking them with military forces.

Why was christianity so appealing to the people of the roman empire

In 1819, what did the united states obtain from spain for $5 million?