questions from a stranger

I find the images of the American flags in front of the house really fascinating.
Has it been a tradition with you since the beginning of your country's history? in all regions?
that is odd isn't it?
in all my travels, Europe and South America I have never seen that display of patriotism anywhere else

whats even stranger is when you get Mexicans move to the US, and then they start waving their flag

(my avatar picture is my flagpole)