The United Nations promotes and enhances globalization in a number of ways. This is particularly true if we think of globalization in more than just economic terms. If we consider the fact that globalization also involves things like the globalization of norms and ideas, we can see that the UN has even more of a role to play.
In purely economic terms, the UN and its associated organizations do a great deal to promote trade between nations. Organizations such as the IMF, the World Bank, and the World Trade Organization work closely with the UN. They promote trade between countries and they promote policies within countries that would make it easier for them to trade with one another. By doing this, they promote economic globalization.
However, the UN also has a role to play in other aspects of globalization. Most specifically, the UN is very active in trying to promote democracy and open governance. This is a form of promoting the globalization of ideas and values. The same is true of the UN’s efforts to do things like promote international law and international human rights.
In these ways, the UN and affiliated agencies do much to promote globalization broadly defined.