How did new national borders disrupt trade and farming in the Balkans?

The creation of new national borders in the Balkans frequently disrupted long-standing economic, social, and cultural patterns, as these boundaries were often drawn without regard for existing regional activities.1

The impact on trade and farming included:

• Disruption of Traditional Routes: Established patterns of movement, such as Vlach shepherds driving their flocks across the peninsula or Bulgarians transporting sheep to markets in Edirne or Constantinople, became significantly more difficult to maintain.1
• Loss of Access: New frontiers often cut off villages from their essential summer pastures, as well as from vital cultural and religious sites, including favorite shrines, churches, or monasteries.1
• Economic Isolation: Monasteries and local communities were frequently separated from distant properties upon which their income and livelihoods relied.1
• Market Interference: Traditional fairs, which had served for generations as the primary medium for exchanging products, were disrupted by the imposition of these new state boundaries.1

These challenges were exacerbated by the fact that these "modern" states were being established in regions where social and economic conditions remained largely traditional and agrarian.1