Fertile land and food supplies would be the answer
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Jerusalem and Constantinople
Manslaughter involves a Non-Premeditated Intent to kill. Involuntary Manslaughter would be a Non-Premeditated, Accidental "Murder."
Murder itself is having the Intent to kill, and Planning to do so.
The Taj Mahal was part of the Mughal Empire, since it was this empire that used to rule over what is now present-day India, where the Taj Mahal is located. It remains one of the world's greatest tourist attractions.
B. and E. marked the downfall of the Inca empire, for obvious reasons. Disease and civil war would obviously kill the empire, and taking an important leader would also mark great chaos within the empire. A. and C. are not to be ignored however, considering that maintaining peaceful relationships with the Spaniards only brought death and chaos to the Aztecs, all from the Spaniards.