What were 3 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