Mortar / Iron ties / Dome beams / Pressure of pillars and beams
I would say A. Franz Kline. hope this helps.
1. the first appearances by fisk jubilee singers
2. the civil war
3. the great depression
4.The height of the civil rights struggle in the united states
The Constructive Critique, it helps let the movie producers know what they liked and didn't like about it and what changes to make before airing it out or for their next movie