The Middle-East

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This sounds good. It's tapping into the roots of the Ottoman Empire, and it worked in Europe (until they went the proverbial bridge too far with the euro):

A recent example suggests that this model is more than a historical artifact. Six years ago, Turkey, Syria, Lebanon and Jordan announced a free-trade zone and visa-free travel among the four countries. Economically, the Arab world and Turkey became more integrated than they had been for nearly a cen­tury as trade doubled to $30 billion between 2007 and 2011.  Arab travel to Turkey rose by nearly 50 per­cent in 2010 compared to the previous year. 

Soon after, Syr­ian protesters, inspired by popular revolts in Tunisia and Egypt, took to the streets and were met with a vi­cious response from the Assad regime.  By the fall, Turkey and others imposed sanctions on Syria, and the Levantine integration project disintegrated. This short-lived integration experiment provided a peek at the potential for a new turn in the region’s politics.  Economic integration, by definition, offers a shared vision of prosperity, and allows insulation against the sectarianism and ethnic hatred which fuels violent extremists, including ISIS and others.

An Innovative Approach to Middle East Peace Based on Trade and Commerce | RealClearPolitics

Difficult to start now with all the turmoil, but it remains a good idea.