I have a good idea on some of these.
Not sure.
March 4th pretty sure.
I know this is FDR.
Well FDR was also sworn in March.
The view is much better but I think more importantly the ability to hold a large crowd on the west side(mall side) of the building.
I know this is Tommy Jeff.
You got it. It is on the 20th due to the 20th Amendment, but it was March 4th before that.
The crowd is important on the west side as well, it is also mentioned that Reagan moved it over there because he wanted to face California when he spoke, but in practical terms, the crowd was the big thing.
Your turn to post one.