Peruvian President Pedro Pablo Kuczynski has gone from the frying pan to the fire. Just three months ago, Peru's embattled president survived impeachment proceedings over allegedly illegal payments, and now his legislative foes are circling again in a bid to unseat him in a March 22 session. But regardless of the short-term political fallout surrounding Kuczynski, instability is unlikely to blight Peru in the long term: Even if the president is impeached, the economic road ahead for the world's second-largest copper producer appears smooth -- a few short-term bumps notwithstanding....