Isolationists are gaining ground worldwide. From worries about losing 
jobs to concerns about the erosion of social values and cultural norms, 
disengagement and retreat from the international stage is seen as a 
viable solution to the looming challenges ahead.
The most glaring fact is that Britain and the United States are at 
the forefront of seeing withdrawal as an answer to problems facing a 
rapidly evolving world.
But far from offering any longer-term solutions to the real worries 
of losing out to international competition, the isolationists are at a 
real risk of losing their political, military and social and economic 
power.
With Brexit, non-EU countries are reassessing how they continue to do
 business in Europe, as Britain can no longer remain their gateway to 
Europe.
Never mind that for countries like Japan, Britain had been their base
 in Europe. Corporations including Toyota and Hitachi created over 
140,000 jobs across UK as a result. 
But while Brexit supporters have touted that leaving the European 
Union will enhance British economic competitiveness, such signs have yet
 to emerge.
In fact, the IMF predicted in October that Britain’s GDP growth will 
fall to 1.1% in 2017, compared to 2.2% growth in 2015. This is a direct 
result of Brexit and inspire of the British pound’s depreciation.  
With even the staunchest of U.S. and British allies frustrated by 
their retreat, those supporters are already beginning to take matters 
into their own hands.
But the real cost of London’s 
isolationist policy may well be that it has shaken the foundations of 
relations over the decades that spills out well beyond the economic 
realm.
The intense national debates within Britain 
ahead of the referendum underscored the unexpected strength of the 
anti-trade, anti-globalization and ultimately, anti-foreigner stance of 
many voters.
With popular sentiment becoming more 
insular, Britain’s reliability as an ally in diplomacy and in security 
issues has come into question. the concerns are thus not just limited to
 trade relations with Europe and beyond.
Moreover, 
confidence in a Britain that has the will and the wherewithal to be a 
leader in addressing transnational issues, not least to ensure global 
economic stability, has faltered as well.
In short, the
 Brexit referendum that supposedly was to make Britain stronger has 
actually weakened its position on the global stage, at least in the near
 term. 
Still, Britain is not alone in paying a price 
for its strategic isolationism. International disillusionment with the 
United States has also begun, especially as Washington continues to shy 
away from a global trade deal that it has been instrumental in crafting.
The
 economic merits of signing on to the Trans-Pacific Partnership aside, 
the fact that the United States could walk out of a negotiation at the 
eleventh hour, that it had been an integral part of puts U.S. 
credibility on the line.
As governments of the 11 other
 TPP member countries are pushing hard to have the deal ratified by 
their legislators, the fact that both U.S. presidential candidates are 
united in rejecting the TPP – at least as it currently stands – has been
 alarming.
In particular, blaming foreign competition 
for a growing income divide in the United States can hardly be seen as 
encouraging for overseas investors. At best, such “reasoning” is a wild 
stretch of the truth. 
The trend to blame outsiders for
 many U.S. economic woes, when domestic reforms and reinvestment into 
projects, especially infrastructure, could do much to spur growth, has 
been alarming.
Like Britain, the United States 
continues to enjoy much international goodwill as a global leader in 
promoting democracy and free markets that it can continue to draw upon.
Yet,
 as public opinion in both countries continue to support greater 
protectionist measures and scaling back on global commitments, that 
goodwill may whittle down far more rapidly than expected.  
Read moew: How the United States and UK Risk Their Global Goodwill - The Globalist