Unlike economic or military power, "soft power" is harder to quantify- it's perceptions and opinions. The story of its loss is not in big events, but in a million little cuts
Example:
"Since 1872, the famed Siebel Institute of Technology has taught generations of #beer brewers the fine art and science of the craft in #Chicago... the school says it has chosen to relocate to #Canada, pointing to policies enacted under the #Trump administration..."
https://www.ctvnews.ca/business/article/world-famous-brewing-institution-leaving-us-for-canada/