What were three chief features of the spanish empire in america?

The three chif features are:
- The spanish empire was regarded as the most populous nation in the new world with the richest natural resources reserve
- The Government was somehow influenced by the Catholic Churches, and they called their civilizations an "empire of towns"
- The spanish was the first nation to introduce slavery in American continent and they also introduce the use of silver and gold as a medium of trade to China and Philippines