In the spring of 1917 the United States entered the First World War. Switzerland and the other neutral European countries came under increasing pressure as the US wanted to embargo their economies. Switzerland had to adapt quickly to the new political order and sent a diplomatic mission to the United States to secure its food and commodity supply. Even though an agreement with the US authorities could be concluded, the policy outcome was strongly influenced by the economic and political agenda of the belligerents. Thus the scope for Swiss foreign policy was limited. The Swiss case shows the increasing influence of the United States and sheds light on the politics of neutrality during the First World War.