Protectionism
Armed conflicts

Protectionism has been accused of being one of the major causes of war. Proponents of this theory point to the constant warfare in the 17th and 18th centuries among European countries whose governments were predominantly mercantilist and protectionist, the American Revolution, which came about ostensibly due to British tariffs and taxes. According to a slogan of Frédéric Bastiat (1801–1850), "When goods cannot cross borders, armies will."

On the other hand, archaeologist Lawrence H. Keeley argues in his book War Before Civilization that disputes between trading partners escalate to war more frequently than disputes between nations that don't trade much with each other. The Opium Wars were fought between the UK and China over the right of British merchants to engage in the free trade of opium. For many opium users, what started as recreation soon became a punishing addiction: many people who stopped ingesting opium suffered chills, nausea, and cramps, and sometimes died from withdrawal. Once addicted, people would often do almost anything to continue to get access to the drug.

Barbara Tuchman says both European intellectuals and leaders overestimated the power of free trade on the eve of World War I. They believed that the interconnectedness of European nations through trade would stop a continent-wide war from breaking out, as the economic consequences would be too great. However, the assumption proved incorrect. For example, Tuchman noted that Helmuth von Moltke the Younger, when warned of such consequences, refused to even consider them in his plans, arguing he was a "soldier," not an "economist."

The ongoing Russo-Ukraine War began in the aftermath of the Revolution of Dignity and the signing of the European Union–Ukraine Association Agreement in 2014, which included a Deep and Comprehensive Free Trade Area for Ukraine and the European Union (EU).
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