The seizure of Iran by the USA would mean them taking control of both the East bank of the Persian Gulf and the Southern Caspian, including their reserves of oil and gas estimated to be the second largest in the world.
Already the US have military control of part of the Caspian basin and of a corridor enabling them to link this area with the Indian Ocean (Afghanistan and Pakistan). They have also taken control of the key areas of the Gulf (Saudi Arabia and Iraq). At the end of this operation, Washington should have complete control over the world’s main hydrocarbon production and reserves. It will control the world economy without the need to share power.
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I suggest people read Zbigniew Brzezinski's The Grand Chessboard.
I utterly despise Brzezinski and his neo-con masterplan for U.S. domination over the Caspian Oil Basin (and of the world's hydrocarbon resources), but his book clearly outlines current U.S. policy.
When one understands this, "terrorism" and "the global war on terror" become irrelevant, as these are the ruses the U.S. uses to advance their political agenda.
The main thing is to resist U.S. policy to the fullest so this goal of theirs will not succeed!!
Failure in stopping the U.S. will result in "Armageddon" (i.e. nuclear war in the Middle East and other countries considered "hostile" towards U.S. "interests")