There is many Sects in Islam, there is also diffrent types of Sunnis with different beliefs, sub sects within.
The Sunnis and Shiites were factions of Muslims that divided into separate sects. They are both considered to be Muslims. Neither of them "took over the Muslims." If you are asking which group gained political power first, the answer would be the Sunnis.
sunnis
The Sunnis are of bigger population. Of world Muslims, 85% are Sunnis.
YES. It is estimated that roughly 80-85% of Muslims identify as Sunnis.
Most Muslims belong Sonni group (or sect). However, there is no critical difference between the Sunnis and Shiites two groups or sects.see related question below for more information.
No group is an enemy to Shiites Muslims. Muslims are Muslims irrelevant to their groups or schools. The main two Islamic groups; Sunnis and Shiites; differ in minor side issues that never imply any enmity between both. Refer to question below.
Sunnis
Most of them are Sunnis.
Muslims were divided into two groups
35% of Iraqi Muslims are Sunnis. See links below.
the majority of people are shia Muslims. but government is sunni.
Shiites and Sunni are two main schools in Islam religion. Shiites are Muslims as Sunnis are Muslims too.Shiites and Sunnis are both Muslims and have different views in some minor and side issues.They are not different as the Catholics and orthodox for example.Both Shiites and Sunnis recite the same Qur'an, believe in same prophet, practice same ritual worships, and go to same places for hajj (or pilgrimage).Refer to related question below.