How did sasuke get the mangakoyo?

Answer 1

Sasuke got his susanoo not only by deafeating Itachi ( Me: Tears!!! )

But by deafeating Danzo also ( Which Danzo has most of the sharingan eyes )

So the main point is . . . Sasuke beat the crap of people who he hates because MadaRa tells him to.

Answer 2

After hearing the truth about itachi he becomes enraged and angry and his mangekyou sharingan awakens.

Answer 3

The Kusangi Blade (Sasuke's Sword) is given to him by Orochimaru. It's the same kind of blade that comes out from Orochimaru's mouth sometimes.

Answer 4

Sasuke have got Sharingan from his uchiya' s blood line

but he awakens the Sharingan when the age of 9. from vivekganandan.

Answer 5

Sasuke is part of the Uchiha clan, in the Uchiha clan, you get the Mangekyo when you witness/commit homicide of someone close to you.