Dual citizenship by birth

There is another form of obtaining dual citizenship.
That is by birth.
Different countries follow different rules in acquiring citizenship upon birth.
There are countries like the Philippines that follow citizenship by blood.
Technically this is called the jus sangguini rule.
The child citizenship follows the citizenship of his or her parents.
If one is born of a Filipino father or mother, than the child is a Filipino.
Other countries like the United States, Canada, Argentina, Brazil follow the rule of birth within their geographical boundaries.
If on is born within U.S. soil, the child is a citizenship of the United States.
This is technically called the jus soli rule.
If a child of Filipino parents (whose country follows the jus sangguini rule) is born in the United States (a country that follows the jus soli rule), then the child obtains dual citizenship at birth.
The child is a Filipino citizen because his parents are Filipino citizens.
At the same time, the child is s U.S. citizen because the child is born inside the U.S. territory.
This type of dual citizenship is different from that obtained via the law on re-acquisition and retention of Philippine citizenship under republic Act 9225.
Those covered under Republic Act 9225 are those natural born Filipinos who loose their Philippine citizenship by obtaining a foreign citizenship, and then wish to re-acquire Philippine citizenship.
Duel citizenship by birth is a circumstance that happens upon birth and the child did not perform any act or ceremony to obtain such dual citizenship.
There will be legal differences and effects between dual citizens by birth, and dual citizens through re-acquisition.
One difference is that one who obtains dual citizenship by birth is a natural born U.S. citizen.
Dual citizenship through naturalization does not produce a natural born citizen.
Theoretically, one can run for U.S. or Philippine president, while the other cannot.
One who obtains dual citizenship by birth needs only to initiate recognition proceedings in the Bureau of Immigration.
Dual citizens by re-acquisition have to undergo a process required by law, such as the taking of an oath of allegiance.
A dual citizen by birth can automatically procure two passports, a U.S. and a Philippine passport.
A dual citizen through naturalization has to undergo the processes of naturalization before being able to procure two passports.