Chinese troops practice marching near a billboard showing Chinese President Xi Jinping and the slogan "Strive to build a People's Liberation Army that obeys the Party, Wins the war and has outstanding work style“ at a camp on the outskirts of Beijing,  (AP Photo/Ng Han Guan)

China’s new challenges

For more than two decades, China has moved from strength to strength. Its economic miracle has lifted hundreds of millions of people out of poverty...