I think a factor in making this easier in Europe is that all phone lines were put in by entirely government owned and operated enterprises, and it can't be argued that the public doesn't own them. In the US, if I'm not mistaken, most of the phone companies were and are at least somewhat private entities that invested private money in putting in the lines. Although often protected by exclusivity etc. this makes the "public owns it" argument much more murky.
Depends. When Ireland privatized it's state owned teleco, it included all the wires going all over the country.
Most of the phone companies were Ma Bell, which had a government-sanctioned natural monopoly from 1936 to its breakup in 1984.
If it was natural, why was a government sanction necessary?
While it ultimately failed, there was a method to the madness.
(I realize that I answered the question "Why is regulation necessary?", but it goes along with the sanction.)
Govt likes monopolies and companies like to have govt keep out competition, which is what the govt did for AT&T.
Interestingly enough, AT&T had been a govt monopoly well before 1936 and then lost that and regained it again in 1936.
AT&T loved being a monopoly.
A natural monopoly means that competitors are kept out naturally. No government intervention would be needed.
Because line sharing and (then) local loop unbundling makes new entries into the market significantly easier (as there isn't the cost to build a whole physical network upfront, and the network can be implemented over time instead) it drives competition in the sky and fees into the ground. It lets challengers challenge, but it's awful for incumbents as they can't just fleece their customers unchallenged.
But more to the point: the US telecoms are deathly afraid of competition. The same thing goes for the CableCo's. Wireless is killing their wireline business and broadband isn't making up the difference. That's why they are looking at network-neutrality killing services/deals they can monetize. That's not necessarily a bad thing, but when one company essentially OWNS the access loop, it's a recipe for high-prices and bad service to customers.
If our FCC wasn't chock full of industry players looking to land a cushy lobbying spot after their term is up, we'd see a lot more competition (and better options for everyone).