After the end of the Balkan Wars, issues affecting the Armenians dominated mainstream politics during which Armen Karo was a deputy from Erzurum. During his four years in Constantinople (Istanbul) as a deputy, he worked for the railroad bill which was known to the public as Chester's bill. Its main objective was to build railroads as soon as possible in those vilayets which were considered to be Russia's future possessions. For that reason neither France nor Germany wished to undertake it, lest they should arouse the enmity of Russia. Another fundamental object was to build those lines with American capital, which would make it possible to counteract the Russo-Franco-German policies and financial intrigues. But in spite of all efforts unable to overcome the German, opposition in Constantinople, although, as the outcome of the struggle in connection with that bill, two ministers of public works were forced to resign their post.