Settling on a topic can be one of the hardest tasks a researcher can face. On the one hand, a topic which is too broad can be hard to handle because you may find too much information on it. On the other hand, a topic which is too narrow can be hard because you won't be able to find enough! It's important to balance these out with a topic which is just right. This may take some time looking at different information on a wide variety of topics in order to pick the right one. This is called background research.
One good thing is you already know the general direction of your topic: it must be about something to do with Latin America during your time frame. From here, you can do some background research to understand the basics about this topic and determine which areas you need to do in-depth research.
Another important part of starting out is reviewing your assignment and making sure you understand the parameters. Here are some questions to ask yourself:
If you are unsure, you should ask your professor for clarification. You need all this information in order to properly research your topic.
Background research can help you get an overview of your topic so you can start to have a working knowledge of the terms, people, places, and ideas that you may encounter later. Two good places to start are encyclopedias and general internet searches. Remember, this is background research and you probably won't use this in your final paper, so the types of sources aren't important. However, they can help you begin to understand a topic.
Imagine I am interested in the Mexican writer Sor Juana Ines de la Cruz. I could search for her using Google or another search engine. In return, I get results from Wikipedia, quotes by her, information from various universities, and the US Government. While this information is not necessarily scholarly, by reading it I can begin to gather more information about time periods, names, locations, and concepts I can use later as I dig farther into the historical record.
For example, I find this JSTOR Daily article in my Google search which gives me some information about Sor Juana. From this alone, I can start to understand her as a proto-feminist and can use her to explore the role of women during colonial Mexico. Additionally, this article gives me two citations for scholarly articles located in JSTOR, a library database.