Clandestine is a funny word

  While it is not blatantly obvious from the information given what America's international policies were, some things are clear.

1. They were not afraid to express opinion. It seemed to me that all the Americans in the film were open about how they felt, and weren't too concerned with damaging relations with other countries. America had a reputation as a powerful country. It's people reflected that.  

2. They found other cultures intriguing. The whole concept of archaeology is the fascination of other cultures' (or your own culture's, but let's face it, in movies you never see an Egyptian archaeologist digging in Egypt) histories, and the subsequent unearthing (usually literally) of missing links.

  In that one Coca-Cola commercial, we saw Egyptians getting hilariously excited about an American beverage. I feel like there's some metaphor here for how America is a fat little kid who gets his dirtly little paws in everyone else's lunch.

  Oh wait. I just made one. 

  In Secret of the Incas, Americans seem to get along reasonably well with the rest of the world. Harry Steele, protagonist of the movie, is seen conversing casually with natives, Peruvians and other nationalities often throughout the movie, and mostly seems to be polite about it. He has a friend who's a barkeep at a hotel, and he is also a tourguide in Peru. We later see a group of Americans running an archaeological expedition in Monte Pichuu. They are working hand in hand with the natives, who are happily assisting them with the promise of finding an ancient, religious artifact they long for:

  The Sunburst. I believe I also remember something about archaeology being different than it used to be. More advanced, and a lot more risky. Throughout the film, Harry Steele is shown as an antihero, who's in it only for the money. He's a liar and a thief. But by the end, once he finds the multi-million dollar Sunburst, he returns it to the Natives, and lets them keep it, rather than running away with the money.