The end of ww1 I think because they are free to do what they want because the war is over
The scaffolding was called centering
Basically, it was a wooden construction that was used as an imitation of the arch and and would hold it until it was built and strengthened after which it was removed. The centering was a key component since it would not be able to build it so perfectly or at all if it weren't for the centering. Such centering is not used anymore due to other contemporary technology.
Answer:
O
A. The House of Representatives
B. The National Association for the Advancement of Colored People
O C. The Republican Party
OD. NATO
Explanation: