A few points:
A) We DID and WERE enforcing a blockade on Japan before the Pearl Harbor attack.
B) A blockade IS an act of war.
C) Egypt would be enforcing a blockade on military ships I assume, ships that are aggressors in war.
D) This war is not 'protecting' our interests/dependence on oil, it is endangering it.
E) Please explain the legal theory behind our 'rights to' the oil of a foreign country.
Wrong. Wrong. Wrong.
There was no, none, zero blockade of Japan. There wasn't even a embargo. In July 1941, the U.S. threatened Japan with an oil embargo unless Japan withdrew from China. Rather than withdraw from China and abandon its imperialist aspirations, Japan chose to attack the U.S. while it still had the oil reserves needed to wage war.
We don't have a right to take another nation's oil, but we and another sovereign nation (like Kuwait, as a completely random example) do have a right to trade oil, dollars, widgets, or whatever, without a bullying neighbor invading, taking all of the commodities, and trying to harm us by denying us something we need by eliminating free trade.