3. what was the "requiermiento"? what was its purpose? was it effective? why or why not

Requiermiento was a document read by the Spanish whenever they approached a land in America or took possession of it in any way.  In the minds of the Spanish, it provided support to their claim of the land, and it was effective in convincing the Spanish that their actions were moral.

It was not effective in convincing the native population, many of whom didn't even understand the document, as it was not translated to them.