The Americans formed a republic, a government in which citizens rule through
<span>"Elected representatives", since this is what primarily differentiates between a "direct democracy" and a "representative democracy". </span><span />
The opportunity cost is the value of the next best alternative foregone. Every decision necessarily means giving up other options, which all have a value. The opportunity cost is the value one could have derived from using the same resources another way, though this is not always easily quantifiable.
Answer: The kingdom of Aksum lasted for around 905 years.
D) continued into the 2010s