Answer:
concrete
The most notable building technique introduced by the Romans was the use of concrete.
Explanation:
The answer is D. Thank you
The contributing factor that led to the Persian Gulf War was the international conflict that was said to be influenced by Iraq's invasion of Kuwait in 1990.
<h3>Why did the US participate in the Persian Gulf War?</h3>
The United States was said to have been involved in the Gulf War. The U.S. troops were said to be sent so as to remove Saddam Hussein's forces from the region of Kuwait.
The US was said to have fought against Iraq because their intention was to keep their oil interest in the Middle East.
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