Matthias Matthijs (“David Cameron’s Dangerous Game,” September/October 2013) suggests that a British exit from the eu would be “disastrous” for the United Kingdom. Imagine the outcry from Washington were the United Kingdom to press Mexico’s case for unimpeded entry of its nationals into the United States. The North American Free Trade Agreement has no provision for the free movement of labor, and no American or Canadian politician would dare suggest such a policy. In contrast, the free movement of people is a bedrock principle of the eu. Yet the U.S. government openly urges the United Kingdom to remain part of the ever-expanding union.

So far, the United Kingdom’s debate over the eu has failed to address the key issue of sovereignty, the most fundamental aspect of which is the ability to control who can reside in a country. All else is trivia.

Winterborne Houghton, United Kingdom