People made me proud to be from the USA, because our athletes have a reputation as being so nice and always willing to stop for an autograph or photo. They showed off the best of American traits: friendliness and openness. Also many athletes train in the US, because we have funding to subsidize facilities. This meant I met athletes from other countries who were grateful for the opportunities my country offers.
For me a normal trip to Europe means that I try to suppress my Americanness as much as possible so I don't get the European anti-American wrath. This time I proudly wore a USA hat and a flag sticker all over London because it was a conversation starter. London felt like a big party and we were all happy to be there representing our countries.