Explanation: The Olmecs were the earliest known Mesoamerican civilization. They were are credited with being the first to do the following: bloodletting and maybe human sacrifices, the invention of popcorn, zero, and might have been the inventor of the compass
The answer would be C. Puerto Rico
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C.) the assassination of archduke Ferdinand.
It triggered a chaos of events. After the assassination Austria-Hungary threatened war on Serbia. They set out some very harsh demands that Serbia must meet.
