It was right in the middle of the Bosporus, Black Sea and the Mediterranean Sea. So, all trade between North Africa, Asia and Europe, had to pass through the capital (Constantinople), causing the Byzantine Empire to become very wealthy due to taxes they charged between the trading.
The US, GREAT BRITAIN, AND FRANCE
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I think that the answer is a. They became entangled in civil wars due to the political crisis.
An oligopoly is where there is a market that has a very limited amount of companies. A common example is airlines
This means that there are a few producers dominating a market in an oligopoly
Don't mistake oligopoly with monopoly. A monopoly has only one producer dominating the market.
Hope this helped!
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It allows them to have their own laws