The crisis of July-August 1914 (the prelude to the breaking out of the World War I), put the Romanian nation in a very complex situation. Romania had three available options: the engagement on the side of the Central Powers, with whom it was linked by a treaty signed in 1883; the alliance with the Entente; the neutrality. At the beginning of August 1914, the Crown Council decided the neutrality of Romania, but this was considered something temporary at Bucharest, who step by step engaged into a more and more close relation with the Entente, on whose side entered at the middle of August 1916. It has to be specified that Romania had national demands on both sides, and this fact was speculated by the two belligerent groups who made pressures at Bucharest. The option of Romania was in concordance with the public opinion who asked with insistence the entry in the war on the side of the Entente. The study concludes that the decisions taken by Bucharest in 1914 and 1916 involved major risks, but the end of the world war confirmed the orientation of the Romanian decision makers. Russia, being under the troubles created by the Bolshevik revolution and the civil war, was not participating at the new political and territorial arrangements in Europe and worldwide. Romania became, ipso facto, a part of Western Europe, entering in its politic, territorial and security system.