Answer:
A.) iron was used to build trains and railroads.
Yes that is true. It was President James K. Polk. Hopefully that answers your question.
The correct answer is Red Summer
It was in the summer of 1919 that hundreds of people died because of the racial riots that were happening in Chicago. After the demobilization in world war 1, white people started fearing African-Americans who had started becoming more and more socialist, so they started to attack them after the riots because they believed that they might suffer the fate of the Russian empire after the communists took the government.
There are two people who invented street lights, but the first one was built by Garret Morgan