If you don't know what you're doing with investing, consider the Malcolm Gladwell thesis that you have to invest ten thousand hours into anything to become adept at it. That largely applies to investing - if you're not willing and able to invest that kind of time into it, then keep it super simple and worry more about your own risk tolerance than about trying to add value by picking stocks or sectors. Is this money that you can afford to tie up for a while, or is there a possibility that you'd need it and thus be forced to sell it at the worst time ?
smt88's advice about ETFs is relevant, but I'd try to keep it simpler than that, especially if you're talking about small amounts. Think stock and bond mix and get a US and non-US index ETF or index fund for each and leave it alone except to periodically rebalance it or add/remove money depending on external needs.
Depending on what Latin American country you're from you may struggle to find a US based broker happy to take your account. In many countries, a broker will need to have a license in the country of a customer's residence to face a retail customer (this works the other way too, so a German broker would not take a US person's account unless they have an SEC registration). You may be able to get around that by setting up a US LLC or LP to put the money into and hold the account, but that's not economical unless you're investing quite large amounts.
Also if you're considering the tax implications, be aware that the OECD Automatic Exchange of Information applies between the USA and many other countries - so the broker may well be sending tax statements to your home country's tax authority who may send you a bill based upon the income generated by the account, with a penalty on top for not declaring it.
