Spain did not immediately realize that the New World was in fact a new continent. Columbus himself died without ever knowing that the land he had arrived to was not India.
However, when Spain realized that this land was completely undiscovered, they decided to explore it. This was motivated by several reasons. On the one hand, they were curious to see what the territory was like. On the other hand, they were also motivated by the possibility of owning such a vast territory and the resources located in it. Finally, they were motivated by the idea of turning the Native American people they encountered into Christians, thus achieving their salvation.
The secret service, which is a federal policing agency that was part of the department of Treasury. At least until 2003, when is became the department of Homeland Security.
The correct answer should be persuasive
Argumentative essays are about presenting your belief on something, supporting a side, presenting the opinions and facts regarding the other side, and then presenting the arguments you have against those opinions and facts. The purpose of an argumentative essay is to persuade something about the topic that you've chosen, so it's best if you answer persuasive.