Actually I just got done reading a great article about slavery in the modern world. (the Sept 03 National Geographic edition, it is a must read) Brazil was mentioned as having slave kids to cut and slash rain forests in order to supply charcoal to the government subsidized steel industry. Steel is the big industry right off of the top of my head because where I live the whole industry has collapsed due to American wages being too high, while many foreign gov's have subsidized steel industries to dump onto the American economy.
And the US needs the rest of the world just as much as they need us. In this day and age of US consumerism this country has overpriced its labor in relation to what it expects to pay for products. The net result is the need to export materials in order to find someone to build products cheap enough for American consumers to want to mass consume them. There are good and bad things that come with investment and trade in other countries. You don't have a country importing cheaper good without people losing their jobs because of it. The alternative is for that country to not import it, but have to have consumers pay higher prices, and have more of their income not be able to be spent on other things.
And you are an econ major right? If you are there is a little nitpicking I am going to do. You don't "create" investments. Investments are used to create other stuff.