they are both Muslims and located all over the world.
shia Muslims are not Kafir. this is a propaganda made by some extremist Muslims who do Takfir. (Wahhabi Muslims)
No, Shia constitute about 15% of total Muslims in the world.
Approximately one of every five Muslims are Shia Muslims. so there are around 350,000 Shia Muslims in the world.
The majority of Persians (today, that's Iran and Iraq) are Shia Muslims.
Sunni Muslims Shia Muslims
The official religion or race of Iran is shia of course, where over 85% of the population is shia. While the rest are sunnis.
at least 1% of egypt population are shia muslims. but sunni/shia relation in egypt is different of other countries. in egypt shia and sunni have close relation and sunni muslims love 12 Imams of shia and sunni muslims of egypt can be called nearly shia. there is no shia/sunni conflict in egypt. egypt Muslims are mostly fatemi that are lovers of Imam Ali and Ahl al Bayt.
Currently Imam Khamenei is the leader of Shia Muslims.
70% of Iraq population are shia Muslims.
Because Sunni muslims consider shia,s are kafir or infideles and have no significance in sunni faith
Muslims in world are near 80% sunni and near 20% shia. researchers have counted up to 260 sect for Islam that they all belong to categories Sunni and shia. the main category of Shia is 12 Imami shia and other sects of shia are nearly extincted. there is at least 300,000,000 shia Muslims in world, but there is no clear stat. shias always have been controlled and killed during history and so usually they hide their beliefs. all 12 Imams of shia have been killed or spent their life in prison by Omayyads and Abbasids.