We take our shoes off in the house, being good Canadians. Personal experience and popular culture has us believing that, in the USA, shoes are left on when entering the house.
But, the stupid question begs to be asked, and perhaps my American friends can set me straight on this burning diplomatic matter: what happens in the morning? Say you are getting dressed in the morning, but you aren't going to leave the house for a couple of hours, do you put your shoes on right away or wait until you are leaving the house? And where do slippers fit into this scenario anyway?
These are matters that we need clarified if we are going to maintain diplomatic relations along the 49th parallel. (And yet, we leave our shoes on at airport security...)