The U.S. economy adapts to change: it creates new technologies and industries and its long-term resilience is (i)____. But America is not entitled to economic (ii)_____ What actually happens depends on private markets and public policies. To be sure, the future is not etched in stone. (iii)____ abound, as any prediction must acknowledge.

The fact the U.S. economy adapts to change and creates new technologies and industries (blue highlight) suggests that its long-term resilience is guaranteed or is incontestable. The next sentence begins with a thought contrastor "but", indicating that the opposite idea is being introduced. Hence, to say that it is not entitled to economic success is the best way of completing the sentence. Since what actually happens depends on private markets and public policies, and the future is not etched in stone, uncertainties abound, as any prediction must acknowledge.