The statement that is proven true with an investigation of NAFTA is: NAFTA created many problems for all three countries that resulted in major changes in the USMCA.
While NAFTA facilitated trade among the member countries (the United States, Canada, and Mexico), it did not allow them to trade with each other for the first time, as they had trade relations prior to NAFTA. Additionally, the USMCA (United States-Mexico-Canada Agreement) did not introduce new member countries, but instead updated and replaced NAFTA, addressing some of the issues and criticisms that arose during its implementation. Lastly, while the statement about job losses and lower prices reflects some outcomes of NAFTA, the statement regarding the creation of problems leading to the changes in the USMCA is a more comprehensive assessment of its impact.