How did Ottoman expansion weaken Venice’s overseas empire?

Ottoman expansion significantly weakened Venice’s overseas empire by systematically challenging its territorial holdings and naval dominance in the Mediterranean. Throughout the 16th and 17th centuries, Venice was forced to dedicate immense resources to defending its political and economic heritage against the advancing Turks.1

Key impacts included:

• Territorial Losses: The Ottoman advance led to the loss of critical Venetian territories, most notably Cyprus in 1571. Later, after a protracted conflict (1645–1669), Venice lost Crete, its final major possession in the eastern Mediterranean.1
• Military Exhaustion: Venice engaged in a series of costly wars to protect its interests, such as the struggle that included the defeat at Préveza in 1538 and the later, ultimately profitless, attempt to hold the Morea (Peloponnese), which was returned to the Turks in 1718.1
• Economic Stagnation: The constant need to defend against the Ottomans, combined with the loss of Eastern markets and the rise of new trade routes, forced Venice into a state of economic stagnation and political conservatism.1

These pressures effectively ended Venetian influence in the eastern and southern Mediterranean.1