What is one function that both nafta and the eu have in common

Free trade agreements

The goal of both NAFTA and the EU is to create free trade between the countries of their given continent. 

Free trade means no tariffs on imported goods and the ability of corporations to move their products from country to country with no penalty. For NAFTA, Canada, the US, and Mexico can freely trade across the borders and tariffs will not be imposed under the treaty.