The Karolands were conquered by the Dutch in 1904, and in 1906 roads to the highlands were constructed, ending the isolation of the highland Karo people. The road linked Medan and the lowlands to Kabanjahe and from there to both Kutacane in Aceh and Pematangsiantar in Simalungun. The first Christian evangelism was conducted among the Karo people in 1890 by the Netherlands Missionary Society. Due to the perceived association with the colonialism of the Dutch East Indies, only a minority of the Karo converted initially, and it was not until after Indonesian independence in 1945 that Christianity acquired significant support among the Karo people.