the answer for above is as follows:
1. This address is from the radio broadcast of 12th March 1933.
2. The term Fireside chat was coined by a journalist to indicate that it was an informal chat. During those days when there were no TVs, cables, Internet or i-Pods, Radio was found in every home.
3. President Franklin D. Roosevel used this medium to talk with common man of USA explaining his views on Radio for 31 times from March 1933 to June 1944.
4. As you would be aware, that USA faced the financial crisis and its repurcussion continued for some years. In 1933, many banks went bankrupt, as rumour spread about their going bankrupt and people started withdrawing cash.
Just to avert a total collapse of the banking system due to rumours, on 6th of March 1933, President F.D.R declared a banking holiday, i.e., an order to close the banks by a government order, till the rumours died down. He addressed the whole country through Radio on 12th or March, which you have quoted above, and it had a positive effect and the economic system survived the crisis. The banks being closed by government of USA caused inconvenience to people, though it was a preventive measure.
This forceful closure of banks has been termed as banking holiday(and it does not mean the usual bank holidays on a fiscal year end - 1st of April in India and 31st of December in other parts of the world and again half yearly holiday on 30th of Sep in India and 30th of June in rest of the world).
In your second question, legislation here means a statute or law(ex. The government moves a legislation to regulate banking).
The series of talks by President FDR on Radio, were termed as fireside chat, as they were informal, though literally FDR never sat beside a fireplace(though the situations were real hot!) but was surrounded by microphones.
I cannot say whether all houses in USA have fireplace. Some desert places like Arizona would rather have some fountain in place of fireplace(are they holding house warming ceremony there?)!
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