For which of the following major world events has the spread of disease been a negative effect?
The technological revolution B. mapping the European world Colombian Exchange Reform

The Columbian Exchange, though a highly lucrative trade route, was a direct source of hardship for many peoples.  Native Americans, for example, had their populations decimated by diseases to which they had no immunity.  Whole communities were wiped off the map, those that remained were too small in number to halt the colonization efforts of the European powers.  

Explanation:

cold

very very cold

`stare decisis is a legal doctrine that obligates courts to follow historical cases when making a ruling on a similar current or future case. stare decisis ensures that cases with identical facts be approached in the same way, unless overruled by the same court or a higher court such as the us supreme court. simply put, it binds courts to follow legal precedents set by previous decisions.

stare decisis is a latin term meaning "to stand by that which is decided".