Final answer:
The North American Free Trade Agreement (NAFTA) would most directly assist Uber and other American organizations who wish to do business in Mexico.
Step-by-step explanation:
The trading bloc that would most directly assist Uber and other American organizations who wish to do business in Mexico is NAFTA (North American Free Trade Agreement).
NAFTA is an economic agreement between Canada, the United States, and Mexico that eliminated or reduced tariffs, taxes, and quotas in these countries. It created the world's largest trading bloc in order to compete with the European Union and the global economy.
This agreement allows more corporate investments across borders and increases foreign ownership of business facilities, which would benefit Uber and other American organizations in expanding their operations in Mexico.