The Konoha Council and Danzo were the ones who told Itachi to kill the Uchiha clan.
because shisui was spying on itachi for the uchiha clan because the uchiha clan new that itachi was working with the leaf to try to overthrow the uchiha clan plus to get the mongekyou sharingan (you must kill your closest friend to obtain the mongekyou sharingan)
yes, itachi killed all of his clan except sasuke and himself Actually Madara uchiha help itachi kill is whole clan except sasuke and himself. OneManga.com Read mangas they are more accurate then the show.
Akatsuki didn't killed the entire uchiha clan. itachi Uchiha did. But it was a mission. Since Itachi Uchiha needed to kill the entire uchiha clan, Madara Uchiha knew everything what has happened. Sasuke Uchiha (The little brother of Itachi Uchiha) Is one of the 3 survivor's. When Sasuke killed Itachi, Tobi (Madara uchiha) told Sasuke the truth about Itachi. Since then, Uchiha Sasuke want revenge on konoha.
Yes. They are all in the Uchiha clan.
Itachi Uchiha part of the Uchiha clan also a member of the akatsuki
Itachi seeked out madara to help kill his clansmen. this was an agreement so madara wouldn't attack the village if he help itachi kill the clan. itachi did kill uchiha shinsui and gained MS. it is proven and it has no evidence proving otherise. shinsui was the best uchiha next to itachi. the clan knew itachi to be a prodigy but did not know the extent of his power. this can be noted when 3 police officer came to question him about shinsui death and he took them out in 2 or 3 seconds. this is full 3 tome sharingan users. itachi abilities was unrivaled because he killed the best of his clan without a scratch. there was no visible wounds on him the next day. which leads us to believe he is extremely powerful. this was then confirmed by the elder to pick itachi out of all his clan members to carry out the massacar. he was the only one talented and skilled enough to do it. madara couldt kill the entire clan by himself and neither could itachi but together they could. remember this is the uchiha clan. the most formidable and known as a battle clan even a genius was just ordinary before them.
Uchiha Madara was a highly skilled ninja who lived years previously. He helped lead the Uchiha clan and was one of the founders of Konoha. He also trained Itachi. Madara helped Itachi with the Uchiha Clan Massacre.
Danzo and the Konoha Council ordered him to wipe out the Uchiha Clan, who were planning a coup d'etat against Konoha. He made a deal with Madara Uchiha, who would spare Konoha if Itachi would help him wipe out the Uchiha Clan, who had betrayed Madara earlier. Madara agreed and the two wiped out the entire Uchiha Clan in one night. (With the exception of themselves and Sasuke Uchiha, Itachi's younger brother due to the fact that Itachi could not bring himself to kill his little brother.)
no itachi was ordered by the hokage to kill the uchiha clan but he could not kill his little brother but he beg the hokage to let sasuke live liar itachi would feel guilty of wiping out a whole clan
It is the hidden leaf village elders who ordered the murder of the uchiha clan, and sent itachi to do it. however Sasuke is not upset because his clan was slaughtered by itachi, but because after ordering itachi to kill the uchihas, the hidden leaf village elders forced itachi to become an outlaw. Sasuke (after learning itachi's true past from madara uchiha) is angry at the leaf village's mistreatment and rejection of his (newly) beloved brother.
Hm... Well, [Spoiler] The 3rd Hokage (I think) told Itachi Uchiha to kill his clan. Itachi left his little brother, Sasuke Uchiha, alive to avenge his clan. But later Itachi joined the Akatsuki. The Akatsuki is a organization to collect all the tailed beasts and rule theworld. So it's realy up to you to choose.