Ka cika wannan magana: A shekara ta 1868, Dana ya kafa wata jarida mai suna "New York Sun", wadda shi ne babban edita. A watan Afrilun 1857, Dana ya gayyaci Marx don ba da gudummawar labarai, galibi kan tarihin soja, zuwa "New American Cyclopedia", ra'ayin George Ripley, abokin Dana kuma editan adabi na "Tribune". A cikin duka, an buga kasidu 67 na Marx-Engels, wanda Engels ya rubuta 51, kodayake Marx ya yi bincike a gare su a Gidan Tarihi na Burtaniya. A ƙarshen shekarun 1850, sha'awar jama'ar Amurka game da al'amuran Turai ya ragu kuma labaran Marx sun juya zuwa batutuwa irin su "rikicin bautar" da kuma barkewar yakin basasar Amurka a 1861 a cikin "War Between the States". Tsakanin Disamba 1851 da Maris 1852, Marx yayi aiki a kan aikinsa na ka'idar game da
Juyin Juya Halin Faransa na 1848, mai taken "The Eighteenth Brumaire na Louis Napoleon". A cikin wannan ya bincika ra'ayoyi a cikin kayan tarihi, gwagwarmayar aji, mulkin mallaka na proletariat, da nasarar proletariat akan jihar bourgeois.