GUEST OP-ED CONTRIBUTOR Los Angeles — NEW Year's weekend traditionally is a time for us to reflect, and to make resolutions based on our reflections. In this fresh year, with the United States seemingly at the height of its power and at the start of a new presidential term, Americans are increasingly concerned and divided about where we are going. How long can America remain ascendant? Where will we stand 10 years from now, or even next year? Such questions seem especially appropriate this year. History warns us that when once-powerful societies collapse, they tend to do so quickly and...