How has the North American Free Trade Agreement affected U.S. unions? U.S. firms with unionized workforces have moved low-skill jobs to Mexico, thus reducing union membership. O Low tariffs and restrictions have allowed U.S. firms to sell more products to Mexico, thus increasing employment for union members. O Mexican organizations have increased wages so that U.S. firms no longer have a cost advantage while moving low-skill jobs to Mexico. O Mexico has moved several manufacturing industries to the United States, thus providing employment opportunities to unionized workers. Which of the following statements is true of the wages of employees in the United States? O Union workers frequently get compensated better in terms of pay than do nonunion workers. O Union wages equaled nonunion wages only after the global recession of 2009. O The wages paid to union and nonunion members differ in the private sector. O Union members always receive more benefits than nonunion employees.