Last week opened with heightened trade tensions between the United States and its allies. It closed with the United States imposing new tariffs on $50 billion of Chinese goods.

Disagreements about trade were the reason for heightened tensions among world leaders. At the end of May, the United States extended tariffs on aluminum and steel imports to U.S. allies.

Early in the week, investors weren’t the only ones riled by the administration announcement it would impose hefty trade tariffs on American allies.

Geopolitics is the intersection of geography, economics, and politics. Last week, there were some fine examples of the ways geopolitical events can create uncertainty.