It totally depends on what level of expectation you had out of yourself when provided the opportunity to migrate. Depression seeps in without notice, when your opinion of yourself declines to a much lower level and your expectations don't look like materializing anytime soon. People who tend to know and believe that, the extent of extreme wealth or other possibilities this land provides are attainable but fail to make that a reality, tend to get depressed. Depression is result of unfulfilled expectations. Expectation comes from how complex or simple the thinking process of a person is. The Guy who is happy and wrote the article probably did not have higher expectation than what he is doing for this stage of his life right now. He is doing pretty well for himself. That is why he is happy. Nobody is same in the level of complexity of their thoughts, thus thought process and expectations differ from person to person across people of different socio-economic background. One's measurement of success for happiness may not fit the other. This is all relative.