Because of the extensive appealing process, it's almost impossible to deport a person from the US.??
Because of the extensive appealing process, it is almost impossible to deport a person from the United States.

Is it correct? or I should change with this one?

Because of the extensive of appealing process, it is almost impossible to deport a person from the United States.

Question

Because of the extensive appealing process, it's almost impossible to deport a person from the US.??
Because of the extensive appealing process, it is almost impossible to deport a person from the United States.

Is it correct? or I should change with this one?

Because of the extensive of appealing process, it is almost impossible to deport a person from the United States.

Answer

Nearly there, but say "appeals process".

[But I'm not sure that statement is true actually; my understanding is that rights of due process and legal representation in deportation proceedings in the US are much restricted compared to criminal proceedings.]

Answer

"appeals process"  James is right

*it may be impossible to FIND someone to deport them, but once found, deportation is practically guaranteed.   I heard stories of people being off the grid for 20 years before being caught.   all you need is one traffic stop.

Answer

It's almost impossible to deport a person from the United States because of the extensive appealing process