An American walks in Paris

An American walks in Paris
his brother-in French. They pass
the Eiffel Tower and the American request:
- How long have you
built?
The French replied in about 3 years.
The American said: Here, this is done
in one year!
They then pass in front of Notre Dame.
- How long?
- About 10 years.
- In the USA, it would have to only 3 years!
They come to the Tower Defence
and American raised again his
question:
- How long?
- What? said the French, this tower? but
it was not there earlier!