I believe the answer is <span>Austria declared war on Serbia.</span>
The correct answer is sphere of influence
A sphere of influence is an area upon which a nation yields power of another,politically,or has an undue influence.The term gained more use politically during the Berlin Conference when european imperialists decraled territorries in africa as spheres in infleunce in an attempt to avert a crisis in europe over colonies.
Answer:
Throughout the mid-1880s, the Northern Pacific pushed to reach Puget Sound directly, rather than by means of a roundabout route that followed the Columbia River. Surveys of the Cascade Mountains, carried out intermittently since the 1870s, began anew.