The telegraph had to utilize morse code, you had to have an operator who knew morse code, for the telephone anyone would use it and understand it easily.
I would go with 'Major sandstorms destroyed the crops' because the Indus Valley civilization most likely declined by something affecting the food.
All of these people were renowned sailors
<span>d. they were all global travelers
</span>
Both were suppressed and held in camps
1. Fugitive Slave Act, 2. Gold mining, 7. Population growth led to sanitation are the only ones I know, sorry I couldn't help you more<span>
</span>
