I think it might be D. Although I am not a genius there were a few Greek uprisings and the Persians had one simple rule that you had to follow, don't ever, EVER betray them.
I am niki but i dont know nothing of this
The Vietnam War was unpopular the whole time but the opposition Grill in 1968 at the Viet Cong lunch the massive offense against Keith cities the military Center the u.s. troops levels escalated so did the casualties as for the Warriors the whole time was unpopular when will it was a no-win situation many people believed with good reason that our development is that the Vietnam was not accomplished in anything yet the enormous numbers of people dying in horror flick and photographic videos were sent back to the US which showed civilian population horrible it was another reason was the war was so pointless was that though the communist countries would Ally together we ignored the fact that all Asian countries hated each other communities do not after defeating as the Vietnam invaded Cambodia and crushed the comunist Khmer Rogue ,one of the few groups that was worse than the nazis
Before the panama canal people from East coast of America who wanted to go to Asia had to either sail around south America which took months or sail towards Asia and go around Africa which took even longer. The panama canal was a short cut right in the middle of central America which cut navigation time in half. Hope I helped. :)