Economic globalization directly leads to economic inequalities between the nations of the global north, or "developed" nations, and the nations of the global south, or "developing" nations. Through globalization, nations of the global north, such as the United States, are able to exploit the labor and resources within global south nations. For instance, through the North American Free Trade Agreement that went into affect in 1994, the United States flooded Mexico with subsidized corn and grains, leaving Mexican farmers unable to make a living. Many Mexican farmers lost their land and homes and were forced to move to the cities to find work in incredibly harsh U.S.-owned factories, or to leave their homeland and attempt to find work in the United States. Through NAFTA, U.S. companies are able to pay Mexican workers incredibly low wages in factories and on their farms because of far less regulated labor laws, while the companies profit immensely. Additionally, these highly unregulated U.S. owned factories and companies, particularly mining companies, have led to environmental degradation on a massive scale within Mexico, which has directly affected the health and lives of working-class and unemployed Mexicans. Additionally, the powerful U.S. companies are able to lobby in the Mexican government against trade, labor, and environmental regulations. This example of how NAFTA has affected Mexicans is just one example of how globalization hurts nations and people of the global south.

This is a questionable premise.  After all, it is globalization that has allowed for the rise of China, which was very much a "developing country" a decade or two ago and is now an economic power.  Globalization really has helped many developing nations catch up to the more developed nations.  Globalization does seem to contribute to increasing inequality within nations, but it does not seem to contribute as much to increasing inequality between nations.

However, if you have to argue that it does, you can argue that globalization allows developed countries to treat developing countries like colonies.  The developed countries, you can argue, let the poorer countries do the low-paid, low-skilled jobs that do not create much wealth.  The developed countries can also buy raw materials from the poorer countries without really helping those countries to develop.  You can say that globalization lets the rich countries exploit the poor ones by buying cheap things from the poor countries without really helping those countries progress to the point where they can compete against the developed countries in producing things that are more profitable.