In terms of British internal affairs, I find it difficult to take a stance on the outcome of the Brexit vote. Britain may be poorer in the short run, but capital and trade will return to normal as markets self-correct, so I do not foresee a prolonged economic slump. I also do not foresee a further unraveling of the E.U., as there are really no other countries like Britain in the E.U. (or more accurately, if other countries do leave, it will be because of structural issues facing the E.U. that predated Brexit). Of course many will disagree, and much more can be said on either of these claims, but I am glossing over them to get to my main point.

There is nothing to be gained by stomping your feet because the referendum’s outcome is not what you may have liked. In fact, in some ways it was refreshing to see a referendum whose outcome was genuinely up-in-the-air. This is how democracy works–if you wish you could impose a result on this referendum, you are missing the point (or maybe I am–counter-point).

Where I believe Brexit can do its worst long-term damage is not to Britain, or the U.K., or even to the E.U. as a whole. Britain and the E.U. at large are modern, democratic, capitalist countries, and as such will prove resilient. It is the world’s developing regions where Brexit will have its greatest impact. These regions need greater contributions in terms of economic aid, democratic capacity building, and conflict prevention / resolution. In terms of conflict prevention / resolution, even before Brexit the E.U. was already punching below its weight, and Britain was one of the few active European armed forces. I cannot see how Brexit will not compromise European contributions on these important fronts: 

Britain’s decision to quit the European Union could send damaging shockwaves through the bedrock Anglo-American “special relationship,” raising questions about London’s willingness and ability to back U.S.-led efforts in global crises ranging from the Middle East to Ukraine.

The loss of the strongest pro-U.S. voice within the 28-nation bloc, as a result of the “Brexit” referendum, threatens to weaken Washington’s influence in European policymaking and embolden Russian President Vladimir Putin to further challenge the West, analysts and former diplomats say.

Phil Gordon, a former senior foreign policy adviser to Obama, expressed concern that Europe will become inwardly focused on Britain’s departure and independence movements on the continent, leaving the United States to shoulder more of the international burden.

Cameron has cooperated closely with Obama in the security sphere. Britain has been a major military player in U.S.-led campaigns against Islamic State militants in Syria and Iraq, an active ally on the ground in Afghanistan and a strong supporter of sanctions against Russia over its role in Ukraine’s separatist conflict.

While “state-building” may be a fools errand, failing to nurture budding democratic movements, particularly in authoritarian countries, risks losing genuine opportunities for development, the slaughter of innocent people, and the setback of these movements for decades.

The global march towards democratization has naturally slowed down post Cold-War as the “low hanging fruit” of democratization realized their democratic aspirations. But with Brexit (coupled with an increasingly assertive Russia and China), the inevitability of eventual global democratization for the first time comes into question.     

The U.S. has more than carried its share of the load in promoting a democratic international order as Europe built itself back up from the ashes of WWII and further modernized following the Cold War. Now, when domestic considerations are forcing the U.S. to at very least not increase its role in the world, Brexit has compromised the capacity of the only partner that could realistically pick up some of the slack.

Perhaps a pan-European army was never going to be a reality, but Brexit likely made it harder to coordinate the build-ups of individual European armed forces in a synergistic way. 

Britain is a valued member of NATO, but if it is weakened economically by its decision to leave the European Union, its leaders might come under public pressure to pare back military spending — even as the United States is pressuring NATO members to spend more on defense.

The European Union often frustrates American presidents, yet the disintegration of the bloc would be a geopolitical disaster for Washington. Even before Britain’s exit, Germany was Europe’s dominant power, andChancellor Angela Merkel was Europe’s dominant leader.

“Britain leaving the E.U. now poses a challenge for Germany,” said Nicholas Burns, a former top American diplomat who now teaches at the Harvard Kennedy School. “It will need to provide even greater leadership to keep Europe united and moving forward.”

What the Brits decide to do within their own country is their own decision. However, the role Britain plays in international affairs has massive global implications. Hopefully Britain’s new leadership understands this, and acts accordingly.