Policy or doctrine of isolating one's country from the affairs of other nations by declining to enter into alliances, foreign economic commitments, international agreements
The United States refused to join the League of Nations, thus isolating itself from other countries.
The belief that a country should maintain a strong military capability and be prepared to use it aggressively to defend or promote national interests.
Austria-Hungary, who wanted to keep their reputation after realizing that if Slavs in the Balkans rebelled against the weakening Ottoman Empire for their freedom, they might do the same in Austro-Hungarian colonies.
Germany declared the area around the British Isles a war zone, in which all merchant ships, including those from neutral countries, would be attacked by the German navy.
A string of attacks on merchant ships followed, culminating in the sinking of the British ship Lusitania by a German U-boat on May 7, 1915.
Land that is unoccupied or is under dispute between parties who leave it unoccupied due to fear or uncertainty.
The area of land between two enemy trench systems, which neither side wished to cross or seize due to fear of being attacked by the enemy in the process