Which theory of ir provide most inside of past and present

The descriptions below are from The IR Theory Web Site created by Mark Beavis of ... A balance of power system functions most effectively when alliances are fluid, when ... Defensive realism holds that the international system provides incentives for ... structural change in world politics, in the past millennium in particular

Explanation:

- "sack of constantinople, (april 1204). the diversion of the fourth crusade from the holy land to attack, capture, and pillage the byzantine city of constantinople divided and dissipated the efforts of the christians to maintain the war against the muslims. the fourth crusade was corrupted from its purpose early on."

- "the crusades were a series of religious wars undertaken by the latin church. the first crusade arose after a call to arms in 1095 sermons by pope urban ii. the first crusade unleashed a wave of impassioned, pious catholic fury, which was of constantinople, the capital of the christian-controlled byzantine empire."

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dude have you found the answer? i go to connexus as well but i think the answer is prime minister