China is ruthlessly pragmatic. It supports North Korea for its own selfish interests. And I believe that China no longer considers us an ally. The current president, Xi Jinping, cultivates close relations with South Korea. He has never met with me, the leader of North Korea, something that the leader of China has always done. At the grand celebrations in Beijing two years ago commemorating the 70th anniversary of the end of World War II, he placed the president of Russia and the president of South Korea at his side. In North Korea, we pay a lot of attention to ceremonies and what they signal.

There is no way to turn off this global economy, nor should one try. Every previous expansion of global capitalism has led to greater prosperity across the world.

I am an American, not by accident of birth but by choice. I voted with my feet and became an American because I love this country and think it is exceptional.

What we see today is an American economy that has boomed because of policies and developments of the 1950s and '60s: the interstate-highway system, massive funding for science and technology, a public-education system that was the envy of the world and generous immigration policies.

China is ruthlessly pragmatic. It supports North Korea for its own selfish interests. And I believe that China no longer considers us an ally. The current president, Xi Jinping, cultivates close relations with South Korea. He has never met with me, the leader of North Korea, something that the leader of China has always done. At the grand celebrations in Beijing two years ago commemorating the 70th anniversary of the end of World War II, he placed the president of Russia and the president of South Korea at his side. In North Korea, we pay a lot of attention to ceremonies and what they signal.

I think that liberals need to grow up.

But now, we are becoming suspicious of the very things we have long celebrated - free markets, trade, immigration, and technological change. And all this is happening when the tide is going our way. Just as the world is opening up, America is closing down.