Why is the united states so well guarded from invasion?

Brainliest to who answers! what will always cause a supply curve to shift to the left?

Einar sees alexandra every day across the room in his history class but has never talked with her. einar likes the way alexandra looks, including the way she dresses and how she wears her hair. he's even more attracted to her apparent intelligence and the way she handles herself in class discussions and during interactions with the instructor. he'd like to know more about her, so he asks one of his friends about her. einar, using a passive strategy to gain information about her, is probably in the preinteraction awareness stage of any relationship that might develop between them. t/f

Which statements describe resources? the use of nonrenewable resources has decreased in recent history. resources are unevenly distributed throughout the world. resource availability is one of the factors people use when deciding where they will live. renewable resources have little value for people. more developed countries (mdcs) use most of the world's resources. the largest use of the world's resources is energy.