Possible Clues:

• Sight from El Paso
• Fancy ordering a barrier for some immigrants
• In Brazil, turnover, for example, hides foreign currency - it divides Mexicans and Americans
• River trip captivates initially obdurate relative
• In Rio, a lot of money from Spain divides Mexicans and Americans
• Capriciously ordering a flower ...
• Mexican border trip accommodating old relative
• Film of old relative taken on board roller coaster, say
• River to the Gulf of Mexico
• In Brazil, big money for energy divides parts of Mexico and America