Editor's note: Joseph S. Nye is a professor at Harvard, and author of the forthcoming book "Do Morals Matter? Presidents and Foreign Policy from FDR to Trump". The article reflects the author's opinion, and not necessarily the views of CGTN.

The dysfunctional politics of Brexit in the UK, and the midterm election reaction against President Donald Trump in the U.S., are generating second thoughts about the populist tide sweeping the world's democracies in recent years. In fact, second thoughts are long overdue.

Populism is an ambiguous term applied to many different types of political parties and movements, but its common denominator is resentment of powerful elites. In the 2016 presidential election, both major U.S. political parties experienced populist reactions to globalization and trade agreements. Some observers even attributed Trump's election to the populist reaction to the liberal international order of the past seven decades. But that analysis is too simple. The outcome was over-determined by many factors, and foreign policy was not the main one.

Populism is not new, and it is as American as apple pie. Some populist reactions – for example, Andrew Jackson's presidency in the 1830s or the Progressive Era at the beginning of the twentieth century – have led to democracy-strengthening reforms. Others, such as the anti-immigrant, anti-Catholic Know-Nothing Party in the 1850s or Senator Joe McCarthy and Governor George Wallace in the 1950s and 1960s, have emphasized xenophobia and exclusion. The recent wave of American populism includes both strands.

The roots of populist reactions are both economic and cultural, and are the subject of important social science research. Pippa Norris of Harvard and Ronald Inglehart of the University of Michigan have found that cultural factors long antedating the 2016 election were very important. Voters who lost jobs to foreign competition tended to support Trump, but so did groups like older white males who lost status in the culture wars that date back to the 1970s and involved changing values related to race, gender, and sexual preference. Alan Abramowitz of Emory University has shown that racial resentment was the single strongest predictor for Trump among Republican primary voters.

But economic and cultural explanations are not mutually exclusive. Trump explicitly connected these issues by arguing that illegal immigrants were taking jobs from American citizens. The symbolism of building a wall along America's southern border was a useful slogan for uniting his electoral base around these issues. That is why he finds the idea hard to give up.

Even if there had been no economic globalization or liberal international order, and even if there had been no great recession after 2008, domestic cultural and demographic changes in the U.S. would have created some degree of populism. America saw this in the 1920s and 1930s. Fifteen million immigrants had come to the U.S. in the first 20 years of the century, leaving many Americans with an uneasy fear of being overwhelmed. In the early 1920s, the Ku Klux Klan had a resurgence and pushed for the National Origins Act of 1924 to “prevent the Nordic race from being swamped,” and “preserve the older, more homogeneous America they revered.”

Similarly, Donald Trump's election in 2016 reflected rather than caused the deep racial, ideological, and cultural schisms that had been developing in reaction to the civil rights and women's liberation movements of the 1960s and 1970s. Populism is likely to continue in the U.S. as jobs are lost to robotics as much as to trade, and cultural change continues to be divisive.

The lesson for policy elites who support globalization and an open economy is that they will have to pay more attention to issues of economic inequality as well as adjustment assistance for those disrupted by change, both domestic and foreign. Attitudes toward immigration improve as the economy improves, but it remains an emotional cultural issue.

In mid-2010, when the effects of the Great Recession were at their peak, a Pew survey found that 39 percent of U.S. adults believed immigrants were strengthening the country, and 50 percent viewed them as a burden. By 2015, 51 percent said that immigrants strengthen the country, while 41 percent said they were a burden. Immigration is a source of America's comparative advantage, but political leaders will have to show that they can manage national borders – both physical and cultural – if they are to fend off nativist attacks, particularly in times and places of economic stress.

Still, one should not read too much about long-term trends in American public opinion into the heated rhetoric of the 2016 election or Trump's brilliant use of social media to manipulate the news agenda with cultural wedge issues. While Trump won the Electoral College, he fell three million short in the popular vote. According to a September 2016 poll, 65 percent of Americans thought that globalization is mostly good for the U.S., despite their concerns about jobs. While polls are always susceptible to framing by altering the wording and order of questions, the label “isolationism” is not an accurate description of current American attitudes.

Since 1974, the Chicago Council on Global Affairs has asked Americans annually if the U.S. should take an active part in, or stay out of, world affairs. Over that period, roughly a third of the public has been consistently isolationist, harkening back to the 19th-century tradition. That number reached 41 percent in 2014, but, contrary to popular myth, 2016 was not a high point of post-1945 isolationism. At the time of the election, 64 percent of the respondents said they favored active involvement in world affairs, and that number rose to 70 percent in the 2018 poll, the highest recorded level since 2002 (which had been reached in the aftermath of the 9/11 terrorist attacks).

Strong support for immigration and globalization in the U.S. sits uneasily with the view that “populism” is a problem. The term remains vague and explains too little – particularly now, when support for the political forces it attempts to describe seems to be on the wane.

Copyright: Project Syndicate, 2019.

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