China ’s president, Xi Jinping , travels to Pakistan on Monday laden with tens of billions of dollars in infrastructure and energy assistance on a scale the United States has never offered in the past decade of a close relationship, a gesture likely to confirm the decline of American influence in that nation. Mr. Xi, making his first overseas trip this year, and the first by a Chinese leader to Pakistan in nine years, will arrive fortified from the robust reception to the new China-led Asian Infrastructure Investment Bank , and is looking to show that China can make a difference in a friendly, neighboring country troubled by terrorism. Pakistani officials say that Mr. Xi will be signing accords for $46 billion […]