You can probably confirm whether or not those sites are actually blocked/banned by your government. Just try asking your internet service provider. They should be able to clear that up for you. Is bitcoin illegal in your country by the way?
And yep, same as the others, the only reason I sometimes can't access some of those sites is when there are problems with my connection or a problem with the site.
Anyway, again, I suggest confirming with your service provider. They should know if a site is blocked/banned/illegal. It's always better to be sure. Can't just assume things.
Most of people don't even know what bitcoin is here so I don't see how It could get banned ,
It's not ... as far as I know. I think there is no need to ask my ISP as I just checked a forum (of my country) and It seems like some people are having the same issue and others are others who are able to access it just fine (from different states) so probably an issue of location. I also checked the newspaper and there is nothing about it being banned or blocked.
I tried to use a proxy (Kproxy.com) as stated above and It's working fine and same thing goes with using an VPN but things are so slow so I assume that the government did indeed block the website , and no It has nothing to do with the internet speed as I can play some games without even lagging.
Glad you got that sorted out??. lol.

Was bewildered since you were quite adamant it was the government banning/blocking those sites.
And as far as I know, there is currently no government who has taken such drastic steps to ban anything bitcoin related to that extent.Yet.
Anyway, turns out, just like previously suggested by others, it's an issue with the service connection.