Seven United States presidents have made presidential visits to Northern Europe.
Richard Nixon became the first incumbent president to visit a Northern European country when he went to Iceland in 1973.
The first trips were an offshoot of the general easing of the geo-political tensions between the U.S. and the Soviet Union during the Cold War.
To date, every nation in the region has been visited at least twice: Finland (7), Denmark (4), Latvia (3), Estonia (2), Iceland (2), Norway (2), Sweden (2), and Lithuania (2).