Which piece of evidence explains why Bismarck believed that European countries needed to work together? A Bismarck feared that neighboring nations like France and Austria-Hungary might try to destroy Germany. B Bismarck wanted to use different alliances to balance power in Europe. C Russia left the alliance in 1878, so Germany and Austria-Hungary formed the Dual Alliance in 1879. D It stated that the members of the alliance only had to help defend each other, not help each other attack other nations.

From Prussia to Germany, the diplomacy of Minister Otto von Bismarck was marked more by continuity than by change. Although the crises he strove to provoke did not degenerate into global war during his time, his politics nevertheless contributed to the deterioration of the Concert of Europe in its classical sense: rise of unilateralism, formation of permanent alliances that grew increasingly rigid, as states were prompted to seek their own security through belonging to opposing blocks.  

Bismarck is known for his provocations regarding Europe, from his “Who is Europe?” remark directed in January 1863 to British Ambassador Buchanan, to his note—”Who speaks of Europe is in error”—appearing in the margin of a letter from the Russian Chancellor Gorchakov in 1876. The historiography has long told us that he was successively the troublemaker and the peacemaker of this Europe, and has identified a major diplomatic shift in the years 1875-1876.

The question arises as to whether the opening of Central European and Mitteleuropean archives since the 1990s has cast doubt on this interpretation.

None would deny that during the 1860s Bismarck was waging war in Europe. We will nevertheless be wary of the usual phrase, “wars of German unification,” that is used for the three armed conflicts opposing Prussia with Denmark in 1864, Austria in 1866, and France in 1870, for it reveals a somewhat teleological vision. Recent research shows that there was no great pre-established plan that Otto von Bismarck—called on in September 1862 by the King of Prussia William I to be Minister-President and Minister of Foreign Affairs—derived from his famous speech, that called for final victory “by iron and blood.” Explanation:

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heartless

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because the gravitational attraction of our sun for the earth is the centripetal force causing the earth's circular motion around the sun, we can use netwon's law of universal gravitation to find the mass of the sun without ever actually visiting the sun. this is the same technique you would use to determine the mass of cygnus x-1 with a probe. the earth, orbiting the sun, plays the same role as the probe sent to orbit cygnus x-1.

f(force of gravity) = f(centripetal force)

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