How many presidents have their been in the United States?
user
Well the first President was George Washington, and so far there have been 43 Presidents since then.
assistant
How many presidents have their been in the United States?
user
There have been 46 presidents, which is so many that it makes it hard to count and keep track of them.  I think the best way is to just say that it is currently President Trump, but that in the past there have been many, many presidents.
assistant
How many presidents have their been in the United States?