Do people do this in other countries too?
Yes. We have those crosses in Poland too. Often decorated with some plastic flowers and stuff.
About the flag I noticed the weird (for me) obsession with it in USA. We don't just put out flag all over everything and it doesn't hang in front of the house all year round. We do put it out for some national holiday only.
But then again our flag is pretty boring :p
Good to know. Lol, there's usually plastic flowers and such with the ones here, that one had some garland and a Christmas stocking on the back side of it.
In the 90s it was like that here with the flag too, the Cold War was 'over' and nobody was really all that worried about it. Then 9/11 came along and all of sudden flags were everywhere it seemed, then it just went downhill from there.
Lol, I've always been a little jealous of Mozambique's flag, they've got an AK-47 on it which seems much more interesting than stars or stripes.