After the proclamation of our Republic, the construction of the Grand Harbor Breakwater, which was unfinished by the Ministry of Nafia, was completed in 1929. However, those same years were the most difficult years in the history of Amasra. In the late 1920s and 1930s, Amasra immigrated heavily with the reduction of the production of coal mines and the loss of attractiveness and shipping in parallel with the economic depression in the world. Amasra, whose first municipal organization was established in 1901 with the Municipalities Law of 1930, was closed because its population was less than two thousand. Marshal Fevzi ÇAKMAK, who visited Amasra in 1931, became a statesman who emphasized the tourism potential of Amasra for the first time. During the great storm that took place in the same year, terrible waves crossed the breakwater and sunk many ships in the harbor. The port could not be used for a long time. After İsmet İNÖNÜ was elected President in 1938, he visited Amasra on his first country trip. It was met by an enthusiastic crowd.

Since the 1940s, a new vitality has manifested itself in Amasra. Especially in the summer months, the first tourist groups, mostly of bureaucrats living in big cities and engineers of the Karabük Iron and Steel Factory, are the main reason for this vitality. In the 1950s, Amasra is now a popular summer resort. Amasra gained a military and economic value with the establishment of the Base Command in 1951 and the extension of the Great Port Breakwater to 650 meters. In parallel with this rapid development, it regained the Municipal Organization in 1955. Selahattin EYİCE is the first elected Mayor of Amasra. President Cemal GÜRSEL, who visited Amasra on November 7, 1960: “The biggest development route is tourism.” He also emphasized the place of Amasra in country tourism at this point. The following year, on August 6, 1961, the 500th Anniversary of the Conquest was celebrated in Amasra with magnificent ceremonies. In the following years, these celebrations continued traditionally.