You can apply for Dual Citizenship to the USA and almost any other country. Many more people than you might think hold dual citizenship. But the road to dual citizenship, with only a few exceptions, is long, twisting and full of "gotchas".
To apply for dual citizenship in the USA, you must first be a citizen of another country and meet the eligibility requirements set by both the US and your other country. You can apply for dual citizenship by following the naturalization process in the US and also by complying with the laws and regulations of your other country regarding dual citizenship. It is important to consult with legal experts or immigration authorities to understand the specific requirements and procedures for obtaining dual citizenship.
If you apply for citizenship in another country your US citizenship is automatically revoked. The US does not recognize dual citizenship. You revoke it in writing at a US embassy, outside the US.
Yes, you can apply for German citizenship and be a dual citizen regardless of the fact if your mother was still a German citizen or not.
The US recognizes dual citizenship.
Not unless you renounce your Canadian citizenship voluntarily.
India does not allow dual citizenship. But you can apply and get a passport-like booklet, at the nearest embassy and consulate general, that will allow you to travel to India visa-free.
Japan does not allow dual citizenship; when the person who holds dual citizenship of Japan and another country reaches the age of majority, Japanese officials ask them to surrender one of the nationalities. So, if you have not renounced your US citizenship yet and can apply for (or have) a valid US passport, you do not need a visa to move to the US for work or any other purposes.
I think that if your father was (and/or still is) a US citizen, then you are also a US citizen no matter where you were born. It should be rather easy to get an american passport in the US embassy or consulate in the phillipines for you. As for your mother, I believe that she has to apply for a US visa or "green card" based on her marriage to your father who was/is a US citizen, or thru your US citizenship if you are over 21 years old.
she have to marry again in israeli
Yes, it is possible to have dual citizenship in the US. This means you can be a citizen of the US and another country at the same time.
Yes, it is possible to have dual citizenship while serving in the US military.
Yes, it is possible for a US citizen to hold dual citizenship with another country.