The only thing virtually certain in economics is change. There will always be innovations, declines, new or depleted resources and these changes will inevitably cause disruptions to people who had been previously content and comfortable. Either you adapt, or you live with what wealth you accumulated or receive from generous people. Whether it be nations or individuals, everyone is subject to inevitable changes and shifting comparative advantages. Protectionism is a losing strategy. Innovative, free thinking, unhindered capitalism creates the wealth and the social justice that follows. The degree of social justice in any culture correlates directly with the wealth that culture generates. Trump will be successful if he unleashes capitalism rather than trying to “protect” it.
If only that were true. It has the potential but unfortunately there are humans involved, and they more often than not have no connection to the country the business resides in. Believe it or not cultures seem to be self interested.