E attacked cities that werent expecting it and he grew his army to great heights
They conquered a vast area over a short period of time with a great deal of violence and cruelty.
The policies of containment used during the Cold War (which were the Truman Doctrine and the Eisenhower Doctrine) both used the economy to help out other countries to stop the spread of communism. The Eisenhower Doctrine in addition used military forces.
The Bush Doctrine is different because it actually tried to implement democracy into other countries (such as the middle east) in an attempt to stabilize the government.
"<span>He divided the empire into two halves and shared his power with a co-emperor" would be the best option from this list, since this was greatly credited with saving the empire from external ruin.</span>