the love of bread is something that varies from place to place, i can't provide an exhaustive list but I have some general contours of it in my head (the other thing like this is gardens, where the basic concept is very present in some places and totally absent in other places).
western europe including the UK is obviously a bread mecca. everyone loves it and eats it all the time. as with everything in europe it varies a lot over quite a small geographic area. france has its own government-supported thing going on and the continued existence of small bakeries everywhere (because essentially everyone in france decided that culture had peaked in 1960 and didn't want anything to change) makes it probably the winner in global bread terms. the basic formula is great and it hasn't been much diluted by factory production. honourable mention goes to germany with its love of stodgy thick bread. spain is surprisingly mediocre in my experience, i have no idea why, there's a lot of bakeries about but it always tastes a bit hard to me. i guess they like it like that. the UK is pretty good i think, it's been tesco-ised but the stuff you get in supermarkets isn't bad, and you can get baguettes and things from the co-op that i think are great. like everything related to food in the UK the unusual and culturally specific transformation of food selling to being concentrated in supermarkets and the associated tendency towards factory production hasn't been kind to the quality of bread you get, that transition has been comprehensive, and widespread bakeries are essentially a thing of the past (or at least we are in a temporary phase where that model is dormant).
north america has imported the bread tradition from its european roots but unfortunately has taken it in a very different direction, and in the US at least (no idea about canada), factory production is totally dominant, and for whatever reason the quality is nowhere near as good as UK supermarkets. your standard loaf from a shop often feels as though its been on the shelf for weeks. i have no idea why it's made to be so tough as well, you really have to rip it apart with your teeth. there are bakeries around but, to take new york as an example, good bread costs literally $10 and you're only really going to find it in a sexy neighborhood where there's enough people with money to buy such things. it is a shame. however, linked to that, people aren't nearly as obsessed with bread as they are in england, so you get your stodge from other things. the absence of the Supermarket Sandwich Hegemony that you get in the UK means that your lunch options are far more varied. continuing south, once you get to mexico you're in tortilla land, which I'm not sure counts as bread, particularly as they're made from corn. maybe there's some bread action in the southern part of south america, but again in the northern part of south america (peru, colombia etc) although there is bread about i have the impression that it's not a very wheaty place. for about a month i ate only from one bakery in ecuador near my house while writing, it's the skinniest i've ever been, it was great, and a lot of that was more baked goods using bread than bread itself from what i can remember. the carribean is not a wheaty place, i don't think there's any bread there at all.
africa likewise, i mean obviously its massive, but i can't recall much bread action. again i think the emphasis is on other things. ethiopia is the exception to that, as it seems to be for so many things, but that place seems to have so much more in common with the middle east than africa anyway. the arab world, if you'll accept that geographical definition, has some serious bread action. the levant in particular is great for flatbreads and the availability of for example manoush all over the place in beirut, where they have the oven there are you watch them chucking the dough in, means that there's quality bread easily available. the symbiotic evolution of hummus is a further advantage in this reason. there is no bread culture as you can imagine in the gulf, i don't think nomadic bedouins in the desert were that well set up to grow wheat or develop a system of bakeries. i have no idea what goes on in iraq and iran, but by the time you get to afghanistan you are in bread heaven. afghanistan is surprisingly a bread-based country. everyone eats it all the time every day. in the rural areas everyone has a tandoor in their house to make bread. in the rural areas its apparently considered a bit shameful to get your bread from a bakery because you should be making it at home. in the cities there are bakeries on every corner with these lads constantly making bread. it's educational - the bread genuinely starts to taste pretty bad if its more than an hour old. but that's not a problem, because you can get fresh bread all the time, except, as i've discovered by driving round kabul looking for it, at 4am there is no way to get bread at all because everywhere is shut. there's also a lot of variety of types of bread and shapes of bread and style of making bread. i think it comes second to france to be fair, but second is still pretty good.
getting into south asia, bread is not exactly king, due to the competition from rice, but there is still a strong bread culture, with the various forms of bread that you're all familiar with (naan, roti, paratha and their subgenres) being available to different extents in different geographies and, to be honest, micro-geographies. pakistan tends to lean towards nice oily paratha, whereas in bangladesh you can only find naan after 4pm, and no fucker will make you naan before that time, i don't know why. but there is roti everywhere so it's OK. this bread doesn't seem to come from bakeries so far as I can tell, it just seems to appear on my plate at restaurants, and in retrospect this does seem strange. probably there are bakeries everywhere but i can't remember ever going to one which is odd because, i don't know if its obvious, i like bread quite a lot. there is then a disjuncture, as with everything, once you cross the hills that separate bangladesh from myanmar. because in south-east asia there's very little bread action. the culture just seems to stop. there is french-style bread and laughing cow cheese in vietnam and laos, but you can trace the roots of this easily, and while it does seem to have caught on a bit in the cities, these places don't exactly have a rich bread culture. i'm not sure about china but in general again i don't think bread is much of a thing up there.
australia i vaguely remember having pretty good bread. i have no idea what goes on bread-wise in the northern bit of central asia or in russia or like mongolia. i'm not sure where the northern border of the bread lands lies. but essentially so far as bread goes, there is a stretch from ireland to bangladesh where bread is a strong and ancient tradition, and outside of that belt, places vary bread-wise between non-existent and mediocre.