What USA though Israel should have own, is actually a occupation, annexation.

OP is from Bangladesh so here's a neutral response from an Indian.

Historically: Golan has changed hands from Jewish tribes to Greeks (Alexander) to Romans, to Persians and so on till 630 BC; when the Querishi tribe (Prohpet's) took over. This was the beginning of Islam's sweep not only over the Mediterranean states (which were Christian / Jewish) but also Persia (Zoroastrian) and Asia.
Did the Prophet ask for this sweep?

International law states that land gained by defensive or offensive wars cannot be annexed. - Wiki

International Law does not state that if you throw a stone at me, the stone remains yours.

Golan was the rock over which the Syrian army lined their tanks to sweep into Israel; and would have succeeded due to numerical superiority (and height)

The part of Golan that remains with Syria is also the stronghold of Syrian opposition holding out against the Army. A secondary question is to which Syria should Golan be released to: Syrian Shia, (army); or Syrian Sunni (the majority, in opposition)?

For members who are unaware of the division in Islam, it's similar to the English Protestants and the Roman Catholics.