They are somewhat interchangeable however (The trade center would display the trading history) refers to simple future time while (The trade center will be displaying the trading history) refers to a time in future where the job of displaying will be in progress at particular time or when an another event starts. e.g. he will be playing when I return home.

It modifies X

I presume you are asking about objective pronoun. If this is the case then, objective pronouns replace those nouns which are in objective case. e.g: yesterday I saw Jhon and told him all the story. In the above example ( him ) replaces Jhon which is in objective case, hence ( him ) is objective pronoun.

"emigrate" to move to other country permanently. "immigrate" to move to other country for job or study etc.

It is correct.

yes