As U.S. shale production plateaus, America’s frackers are looking at opportunities abroad to tap new growth markets and develop emerging shale basins overseas, leveraging two decades of experience and technological innovation. Opportunities abound—from Argentina to Australia—as oil and gas-producing nations look to unlock unconventional resources to increase domestic output and boost energy security. U.S. expertise is the best chance these countries have to develop their shale industries, and American producers and oilfield service…